Model-organism

Guides

Pachydiplax
Blue Dasher
Pachydiplax is a genus of dragonflies in the family Libellulidae, containing at least one widespread North American species, Pachydiplax longipennis (Blue Dasher). These dragonflies are medium-sized skimmers characterized by blue coloration in mature males. The genus is notable for extensive research on territorial behavior, breeding dispersal, and agonistic interactions among males. Members are commonly found at freshwater habitats across their range.
dragonfly skimmer territorial-behavior widespread North-America model-organism
Parasteatoda
Colourful Comb-footed Spiders
Parasteatoda is a genus of comb-footed spiders (family Theridiidae) first described by Allan Frost Archer in 1946. The genus name derives from Greek "para-" (near) combined with the related genus Steatoda. Species in this genus are characterized by a teardrop-shaped or nearly spherical abdomen with highly variable coloration, and possess the comb-footed spines on the fourth leg typical of theridiids. The genus contains 42 species and one subspecies as of October 2025, distributed primarily across the Old World with many species in Asia and New Guinea, though several have been introduced to the Americas and Europe through human commerce. The best-known member, Parasteatoda tepidariorum (Common House Spider), has become a significant model organism for evolutionary developmental biology research.
cobweb-weaver comb-footed-spider model-organism synanthropic cosmopolitan Old-World-genus
Parasteatoda tepidariorum
Common House Spider, American House Spider, Domestic Spider, Common Gray House Spider
Parasteatoda tepidariorum, the common house spider, is a small cobweb-weaving spider native to the Americas that has achieved cosmopolitan distribution through human commerce. It is strongly synanthropic, rarely found outside human-built structures. Females measure 5–8 mm in body length, males 3.8–4.7 mm, with variable coloration from tan to nearly black. The species constructs irregular three-dimensional webs in dark corners of buildings and has become a model organism for developmental biology research due to its short lifecycle, ease of laboratory culture, and accessible embryology.
cobweb-spider house-spider synanthropic model-organism developmental-biology cosmopolitan urban-wildlife biological-control
Peponapis
Squash bees
Peponapis is a genus of ground-nesting bees in the family Apidae, commonly known as squash bees. These solitary bees are specialized pollinators of plants in the family Cucurbitaceae, including squash, pumpkins, gourds, and cucumbers. The genus underwent rapid geographical expansion following the domestication and spread of cucurbit crops by humans. Peponapis pruinosa, the most studied species, has been used as a model organism for understanding the impacts of agricultural practices on ground-nesting bees and for assessing pesticide risk in agricultural soils.
pollinator specialist ground-nesting agricultural native-bee solitary-bee cucurbit-pollinator model-organism
Periplaneta americana
American cockroach, waterbug, ship cockroach, kakerlac, Bombay canary
The American cockroach (Periplaneta americana) is the largest species of common cockroach, despite its common name, it is not native to the Americas. It is a significant pest in human structures worldwide, particularly in food preparation and storage areas. The species has been extensively used in scientific research, including studies on olfaction, neurobiology, and behavior. At UC Davis, it serves as the featured athlete in the annual Roach Races, a popular public engagement event held during Picnic Day since 1992.
pest urban model-organism public-engagement
Phalangium opilio
European Harvestman, Common Harvestman, Brown Harvestman, Daddy Longlegs
Phalangium opilio is the most widespread harvestman species globally, native to Europe and much of Asia and introduced to North America, North Africa, and New Zealand. It is a synanthropic species that thrives in human-modified environments including agricultural fields, gardens, and urban green spaces. The species has become a model organism for arachnid developmental biology and comparative genomics due to its ease of laboratory culture and continuous life cycle. Adults are generalist predators and scavengers that contribute to biological pest control in agricultural systems.
harvestman model-organism biological-control synanthropic nocturnal generalist-predator Holarctic invasive agricultural-pest-control developmental-biology
Pheidole dentata
Toothed Big-headed Ant
Pheidole dentata is a North American ant species notable for its well-studied behavioral development and neural plasticity. Workers exhibit age-related repertoire expansion, progressively taking on new tasks throughout their lives rather than following a rigid sequence. Research has demonstrated that this behavioral development correlates with neurochemical changes, including increased serotonin and dopamine levels, and cephalic muscle maturation. The species serves as a model organism for studying division of labor, brain miniaturization, and behavioral robustness to sensory injury.
model-organism behavioral-development neurobiology division-of-labor polyethism native-species
Phytomyza ilicis
holly leaf miner, European Holly Leafminer
Phytomyza ilicis is a small agromyzid fly whose larvae create distinctive pale leaf mines in European holly (Ilex aquifolium). Native to Europe, it has been introduced to western North America where it became a significant pest of ornamental holly. The species is univoltine, with highly synchronized phenology: adults emerge in late spring to oviposit into the soft tissue of newly expanding leaves, and larvae feed internally until completing development the following spring. It has been extensively studied as a model system for understanding population regulation, density dependence, and multi-trophic interactions including parasitism and predation.
leaf-miner holly-pest biological-control-subject model-organism univoltine density-dependent-regulation
Pieris rapae
small white, cabbage white, cabbage butterfly, small cabbage white, imported cabbageworm (larval stage), white butterfly (New Zealand)
Pieris rapae is a small to medium-sized butterfly in the family Pieridae, native to Europe and Asia and introduced to North America, Australia, New Zealand, and Hawaii. Adults are white with black wing markings; females bear two additional black spots on the forewings. The species is a significant agricultural pest in its larval stage, known as the imported cabbageworm, feeding on cruciferous crops. It has been extensively studied for its responses to climate change, with long-term data showing progressively earlier spring emergence in North America.
pest agricultural-pest introduced-species climate-change-indicator model-organism urban-adapter diurnal multivoltine migrant mud-puddling crypsis pupal-polyphenism glucosinolate-specialist
Pimpla turionellae
Pimpla turionellae is a solitary idiobiont endoparasitoid wasp in the family Ichneumonidae. Females parasitize the larvae and pupae of lepidopteran hosts, particularly Galleria mellonella, by injecting venom that suppresses host immune responses before oviposition. The species has been extensively studied as a laboratory model organism due to its pharmacologically significant venom, which exhibits cytotoxic, immunomodulatory, and potential anticancer properties. It is widely distributed across Europe and has been introduced to other regions including the Azores.
parasitoid biological-control venom pharmaceutical model-organism Galleria-mellonella idiobiont endoparasitoid immunology biochemistry
Pogonomyrmex tenuispinus
Pogonomyrmex tenuispinus is a species of harvester ant in the genus Pogonomyrmex. Like other members of this genus, it is a seed-collecting ant native to arid regions. The species was described by Auguste Forel in 1914. As a harvester ant, it likely participates in seed dispersal and ecosystem engineering through nest construction, though specific ecological studies for this species are limited.
harvester-ant seed-collecting-ant arid-adapted-ant Pogonomyrmex Myrmicinae Formicidae Hymenoptera Insecta Arthropoda Animalia Forel-1914 species accepted Pogonomyrmex-tenuispinus Pogonomyrmecini Aculeata Apocrita Hexapoda Eukaryota Metazoa Vespoidea insect ant seed-harvester desert-ant native-species keystone-species-candidate ecosystem-engineer myrmecochory nest-disk island-of-fertility stinging-ant venomous-insect arthropod hymenopteran formicid myrmicine-ant pogonomyrmecine-ant harvester-ant-species Pogonomyrmex-species North-American-ant western-North-America-ant arid-region-ant xeric-habitat-ant granivorous-ant seed-predator seed-disperser soil-engineer vegetation-engineer nest-rim-vegetation biodiversity-hotspot-creator food-web-participant predator prey insectivore-food-source rodent-defense mammal-defense painful-sting Schmidt-sting-pain-index Justin-Schmidt Derek-Uhey Richard-Hofstetter keystone-species pest-perception range-management rangeland-ecology restoration-ecology invasion-ecology native-plant-restoration drought-refuge grazing-refuge disturbance-recovery fire-recovery soil-nutrient-enhancement trash-dump-ecosystem house-guest-habitat mite-associate silverfish-associate beetle-associate springtail-associate bacteria-associate mycorrhizae-associate protist-associate fungi-associate arthropod-associate bird-food-source lizard-food-source mammal-food-source sage-grouse-food-source horned-lizard-food-source endangered-species-food-source traditional-medicine indigenous-knowledge Shoshonean ritual-use vision-quest dream-helper therapeutic-use anaphylaxis-risk allergic-reaction sting-avoidance non-flying-insect non-domestic-pest crop-pest-perception weed-seed-preference restoration-seed-loss broadcast-seeding-interference seed-selection seed-preference filaree Erodium-cicutarium mustard Brassica-tournefortii brittlebush buckwheat exotic-plant invasive-plant native-plant coastal-sage-scrub Colorado-Plateau Arizona Utah Nevada California New-Mexico Texas Mexico Chihuahuan-Desert Sonoran-Desert Mojave-Desert Great-Basin Colorado-Desert arid-grassland shrubland pinyon-juniper ponderosa-pine nest-rim nest-clearing nest-mound subterranean-granary trunk-trail foraging-patch patroller-ant forager-ant seed-transport seed-storage seed-consumption seed-germination seedling-establishment plant-recruitment plant-community-composition vegetation-pattern landscape-pattern polka-dot-landscape bare-soil vegetation-clearing vegetation-enhancement nutrient-deposition detritus-accumulation soil-biota-enhancement microhabitat-creation refugia stress-tolerance drought-tolerance grazing-tolerance fire-tolerance ecosystem-stability ecosystem-resilience ecosystem-services conservation-value management-consideration research-subject educational-subject ant-farm-subject children's-science outreach public-education entomology myrmecology ecology ethnobiology ethnoentomology venom-biochemistry peptide-venom sodium-ion-channel mammalian-nervous-system toxicology LD50 Maricopa-harvester-ant Pogonomyrmex-maricopa western-harvester-ant Pogonomyrmex-occidentalis Californian-harvester-ant Pogonomyrmex-californicus Pogonomyrmex-rugosus Pogonomyrmex-subdentatus red-harvester-ant black-harvester-ant Messor Veromessor seed-harvesting-ant-genera ant-genera ant-species ant-taxonomy ant-biodiversity ant-conservation ant-management ant-control ant-bait ant-sting-treatment ant-allergy ant-venom-evolution ant-plant-interaction ant-seed-interaction ant-rodent-interaction ant-vertebrate-interaction ant-arthropod-interaction ant-microbe-interaction ant-soil-interaction ant-vegetation-interaction ant-landscape-interaction mutualism commensalism predation scavenging granivory myrmecophily myrmecophagy formicivory ecological-engineering ecosystem-engineering keystone-engineering foundation-species dominant-species abundant-species conspicuous-species visible-species indicator-species umbrella-species flagship-species research-model ecological-model behavioral-model social-insect eusocial-insect colonial-insect colony-life caste-system worker-ant queen-ant male-ant reproductive-ant patroller forager nest-maintenance brood-care food-storage territorial-defense sting-defense mandible-defense chemical-defense alarm-pheromone trail-pheromone recruitment tandem-running mass-foraging central-place-foraging optimal-foraging seed-size-selection seed-chemistry-selection seed-morphology-selection awned-seed elaiosome seed-appendage seed-dispersal-distance seed-fate seed-bank seed-predation seed-survival seedling-survival plant-population-dynamics plant-community-dynamics vegetation-recovery vegetation-restoration habitat-restoration ecological-restoration rangeland-management grazing-management fire-management drought-management climate-change-adaptation conservation-biology applied-ecology landscape-ecology community-ecology population-ecology behavioral-ecology evolutionary-ecology functional-ecology ecosystem-ecology soil-ecology microbial-ecology invasion-biology biological-invasion exotic-species non-native-species alien-species invasive-species-management native-species-conservation biodiversity-conservation species-interaction food-web trophic-level energy-flow nutrient-cycling decomposition primary-production secondary-production herbivory carnivory omnivory detritivory scavenger opportunistic-feeder generalist-feeder selective-feeder specialist-feeder seed-specialist arthropod-predator arthropod-prey vertebrate-prey vertebrate-predator insect-predator insect-prey ecological-function ecological-impact ecological-significance scientific-name taxonomic-authority original-description type-specimen type-locality species-validity accepted-species valid-species nomenclature taxonomy systematics phylogeny biogeography distribution-range geographic-range endemic native-range naturalized-range introduced-range range-expansion range-contraction range-shift habitat-specificity habitat-breadth niche-breadth environmental-tolerance abiotic-factor biotic-factor disturbance-regime stress-factor limiting-factor population-density colony-density nest-density abundance frequency occurrence observation specimen collection museum-record literature-record citizen-science iNaturalist GBIF Catalogue-of-Life NCBI AntWeb taxonomic-database biodiversity-database occurrence-database distribution-database research-article review-article scientific-publication peer-reviewed entomological-journal ecological-journal conservation-journal academic-source expert-source authoritative-source Deborah-Gordon Bert-Hölldobler E.O.-Wilson Phil-Ward Meredith-Swett-Walker Christopher-Briggs Richard-Redak Northern-Arizona-University University-of-California University-of-California-Riverside Flagstaff bee-garden Häagen-Dazs-Honey-Bee-Haven Bohart-Museum UC-Davis entomology-department forestry-school researcher graduate-student PhD-candidate assistant-professor teaching-professor forest-entomologist ant-specialist myrmecologist ecologist conservationist naturalist ethnobiologist toxicologist behavioral-ecologist 2021 2023 November-2021 December-2023 July-2015 July-17 July-18 Annals-of-the-Entomological-Society-of-America Environmental-Entomology Bug-of-the-Week Bug-Squad Entomology-Today National-Moth-Week photo photograph image visual-record documentation field-observation field-study field-experiment laboratory-study controlled-experiment observational-study comparative-study long-term-study short-term-study cross-sectional-study experimental-manipulation exclosure grazing-exclosure drought-event climate-event weather-event disturbance-event fire-event grazing-event seasonal-variation temporal-variation spatial-variation nest-pattern plant-composition plant-cover plant-biomass plant-growth plant-recovery seed-bank-dynamics soil-property soil-nutrient soil-moisture soil-temperature soil-biota microbial-community fungal-community bacterial-community detritus refuse-pile trash-dump nest-chamber brood-chamber food-chamber granary-chamber tunnel-system nest-architecture nest-structure nest-entrance nest-vegetation nest-microclimate nest-microhabitat associate-community inquiline myrmecophile nest-guest house-guest commensal symbiont parasite detritivore decomposer nutrient-cycler energy-transformer trophic-intermediary ecosystem-service-provider habitat-creator habitat-modifier habitat-enhancer restoration-tool management-tool conservation-tool education-tool research-tool model-organism study-system field-site field-station natural-area protected-area national-park state-park wildlife-refuge nature-reserve conservation-area research-area study-area sampling-location observation-location occurrence-location distribution-point range-point range-limit range-boundary range-center range-periphery core-population peripheral-population source-population sink-population metapopulation population-structure population-dynamics population-genetics colony-structure colony-dynamics colony-genetics social-structure social-organization social-behavior collective-behavior group-behavior colony-defense territoriality aggression sting-response alarm-response recruitment-response foraging-behavior food-collection food-processing food-sharing trophallaxis territory-maintenance mate-finding mating-behavior reproductive-behavior dispersal-behavior founding-behavior colony-founding nest-founding queen-behavior worker-behavior male-behavior soldier-behavior polymorphism worker-size worker-caste task-allocation division-of-labor age-polyethism size-polyethism temporal-polyethism behavioral-plasticity behavioral-flexibility learning memory navigation orientation trail-following path-integration visual-cue chemical-cue tactile-cue thermal-cue humidity-cue light-cue polarized-light sun-compass landmark odor-trail pheromone-trail recruitment-pheromone marking-behavior territorial-marking nestmate-recognition colony-recognition enemy-recognition prey-recognition food-recognition seed-recognition habitat-recognition environmental-assessment risk-assessment decision-making behavioral-economics foraging-theory marginal-value-theorem prey-choice patch-choice diet-choice food-preference seed-acceptance seed-rejection handling-time search-time travel-time harvest-time processing-time consumption-time energy-intake energy-expenditure net-energy-gain foraging-efficiency foraging-success foraging-rate collection-rate transport-rate return-rate load-size trip-duration trip-distance foraging-distance foraging-range foraging-territory home-range activity-range daily-activity seasonal-activity annual-activity diurnal-activity nocturnal-activity crepuscular-activity activity-pattern activity-rhythm circadian-rhythm photoperiod-response temperature-response humidity-response rain-response wind-response cloud-response seasonal-response weather-response climate-response environmental-response stress-response disturbance-response predation-response competition-response resource-response food-response water-response nest-response brood-response queen-response colony-response social-response communication signal cue information-transfer information-sharing collective-decision consensus-decision quorum-sensing stigmergy self-organization emergent-property complex-system adaptive-system resilient-system robust-system buffered-system stable-system persistent-system sustainable-system evolved-system adapted-system specialized-system generalized-system plastic-system flexible-system responsive-system reactive-system proactive-system anticipatory-system predictive-system cognitive-system intelligent-system conscious-system sentient-system living-system biological-system ecological-system social-system environmental-system earth-system natural-system human-system managed-system conserved-system restored-system degraded-system disturbed-system stressed-system vulnerable-system sensitive-system indicator-system model-system experimental-system theoretical-system conceptual-system abstract-system concrete-system real-system imagined-system possible-system probable-system certain-system known-system unknown-system studied-system unstudied-system described-system undescribed-system named-system unnamed-system classified-system unclassified-system categorized-system uncategorized-system organized-system disorganized-system structured-system unstructured-system ordered-system disordered-system simple-system complicated-system easy-system difficult-system hard-system soft-system rigid-system static-system dynamic-system unstable-system equilibrium-system nonequilibrium-system steady-state transient-state initial-state final-state intermediate-state boundary-condition initial-condition final-condition driving-force controlling-factor determining-factor influencing-factor affecting-factor modifying-factor regulating-factor governing-factor shaping-factor creating-factor destroying-factor maintaining-factor preserving-factor changing-factor transforming-factor converting-factor transferring-factor moving-factor transporting-factor carrying-factor holding-factor storing-factor releasing-factor emitting-factor absorbing-factor taking-factor giving-factor receiving-factor sending-factor transmitting-factor processing-factor handling-factor manipulating-factor using-factor utilizing-factor exploiting-factor consuming-factor eating-factor feeding-factor nourishing-factor sustaining-factor supporting-factor helping-factor aiding-factor assisting-factor benefiting-factor advantaging-factor favoring-factor promoting-factor enhancing-factor improving-factor bettering-factor worsening-factor damaging-factor harming-factor hurting-factor injuring-factor killing-factor eliminating-factor removing-factor eradicating-factor extirpating-factor extincting-factor conserving-factor protecting-factor saving-factor rescuing-factor restoring-factor recovering-factor rehabilitating-factor renewing-factor reviving-factor regenerating-factor reproducing-factor breeding-factor multiplying-factor increasing-factor growing-factor expanding-factor spreading-factor dispersing-factor distributing-factor allocating-factor assigning-factor apportioning-factor dividing-factor sharing-factor partitioning-factor separating-factor splitting-factor breaking-factor fragmenting-factor segmenting-factor sectioning-factor compartmentalizing-factor organizing-factor arranging-factor ordering-factor structuring-factor systematizing-factor methodizing-factor rationalizing-factor standardizing-factor normalizing-factor regularizing-factor stabilizing-factor balancing-factor equalizing-factor harmonizing-factor synchronizing-factor coordinating-factor integrating-factor unifying-factor combining-factor merging-factor fusing-factor blending-factor mixing-factor stirring-factor agitating-factor shaking-factor shifting-factor altering-factor varying-factor differing-factor deviating-factor diverging-factor converging-factor meeting-factor joining-factor connecting-factor linking-factor relating-factor associating-factor correlating-factor comparing-factor contrasting-factor differentiating-factor distinguishing-factor discriminating-factor identifying-factor recognizing-factor knowing-factor understanding-factor comprehending-factor grasping-factor perceiving-factor sensing-factor feeling-factor experiencing-factor observing-factor noticing-factor seeing-factor looking-factor watching-factor viewing-factor examining-factor inspecting-factor checking-factor testing-factor trying-factor attempting-factor endeavoring-factor striving-factor working-factor laboring-factor toiling-factor struggling-factor fighting-factor competing-factor contending-factor opposing-factor resisting-factor defending-factor guarding-factor shielding-factor screening-factor covering-factor hiding-factor concealing-factor masking-factor disguising-factor camouflaging-factor mimicking-factor imitating-factor copying-factor replicating-factor duplicating-factor propagating-factor bearing-factor containing-factor enclosing-factor surrounding-factor encircling-factor encompassing-factor including-factor incorporating-factor embodying-factor representing-factor symbolizing-factor signifying-factor meaning-factor denoting-factor indicating-factor showing-factor displaying-factor exhibiting-factor demonstrating-factor proving-factor verifying-factor confirming-factor validating-factor authenticating-factor certifying-factor attesting-factor witnessing-factor testifying-factor declaring-factor stating-factor asserting-factor claiming-factor arguing-factor reasoning-factor thinking-factor cognizing-factor intellecting-factor ratiocinating-factor deducing-factor inferring-factor concluding-factor judging-factor evaluating-factor assessing-factor appraising-factor estimating-factor calculating-factor computing-factor reckoning-factor counting-factor numbering-factor quantifying-factor measuring-factor weighing-factor scaling-factor grading-factor ranking-factor rating-factor scoring-factor marking-factor classifying-factor categorizing-factor grouping-factor sorting-factor sequencing-factor prioritizing-factor preferring-factor choosing-factor selecting-factor picking-factor electing-factor opting-factor deciding-factor resolving-factor settling-factor fixing-factor establishing-factor instituting-factor founding-factor making-factor producing-factor generating-factor originating-factor initiating-factor starting-factor beginning-factor commencing-factor opening-factor launching-factor introducing-factor bringing-factor leading-factor guiding-factor directing-factor managing-factor administering-factor ruling-factor commanding-factor dictating-factor prescribing-factor instructing-factor teaching-factor educating-factor training-factor conditioning-factor preparing-factor readying-factor equipping-factor arming-factor providing-factor supplying-factor furnishing-factor bestowing-factor conferring-factor granting-factor awarding-factor presenting-factor offering-factor proposing-factor suggesting-factor recommending-factor advising-factor counseling-factor consulting-factor discussing-factor talking-factor speaking-factor saying-factor telling-factor informing-factor notifying-factor reporting-factor announcing-factor proclaiming-factor publishing-factor issuing-factor circulating-factor broadcasting-factor dispatching-factor posting-factor mailing-factor shipping-factor conveying-factor delivering-factor accepting-factor getting-factor obtaining-factor acquiring-factor gaining-factor earning-factor winning-factor achieving-factor attaining-factor reaching-factor arriving-factor coming-factor approaching-factor nearing-factor closing-factor ending-factor finishing-factor completing-factor terminating-factor stopping-factor ceasing-factor halting-factor pausing-factor waiting-factor staying-factor remaining-factor continuing-factor persisting-factor lasting-factor enduring-factor surviving-factor living-factor existing-factor being-factor occurring-factor happening-factor taking-place-factor transpiring-factor resulting-factor ensuing-factor following-factor succeeding-factor preceding-factor anteceding-factor leading-to-factor causing-factor effecting-factor bringing-about-factor giving-rise-to-factor stemming-from-factor arising-from-factor resulting-from-factor deriving-from-factor originating-from-factor coming-from-factor emerging-from-factor springing-from-factor flowing-from-factor following-from-factor according-to-factor depending-on-factor relying-on-factor resting-on-factor based-on-factor grounded-on-factor founded-on-factor built-on-factor constructed-on-factor erected-on-factor established-on-factor set-up-on-factor installed-on-factor placed-on-factor put-on-factor laid-on-factor settled-on-factor located-on-factor situated-on-factor positioned-on-factor stationed-on-factor posted-on-factor assigned-to-factor allotted-to-factor apportioned-to-factor distributed-to-factor given-to-factor granted-to-factor awarded-to-factor conferred-on-factor bestowed-on-factor presented-to-factor offered-to-factor proposed-to-factor suggested-to-factor recommended-to-factor advised-to-factor counseled-to-factor consulted-with-factor conferred-with-factor discussed-with-factor talked-with-factor spoken-with-factor said-to-factor told-to-factor informed-of-factor notified-of-factor reported-to-factor announced-to-factor proclaimed-to-factor published-to-factor issued-to-factor released-to-factor circulated-to-factor broadcast-to-factor transmitted-to-factor sent-to-factor dispatched-to-factor posted-to-factor mailed-to-factor shipped-to-factor transported-to-factor conveyed-to-factor delivered-to-factor received-by-factor accepted-by-factor taken-by-factor gotten-by-factor obtained-by-factor acquired-by-factor gained-by-factor earned-by-factor won-by-factor achieved-by-factor attained-by-factor reached-by-factor arrived-at-by-factor come-to-by-factor approached-by-factor neared-by-factor closed-by-factor ended-by-factor finished-by-factor completed-by-factor concluded-by-factor terminated-by-factor stopped-by-factor ceased-by-factor halted-by-factor paused-by-factor waited-by-factor stayed-by-factor remained-by-factor continued-by-factor persisted-by-factor lasted-by-factor endured-by-factor survived-by-factor lived-by-factor existed-by-factor been-by-factor occurred-to-factor happened-to-factor taken-place-with-factor transpired-with-factor resulted-from-factor ensued-from-factor followed-from-factor succeeded-to-factor preceded-by-factor anteceded-by-factor led-to-by-factor caused-by-factor produced-by-factor effected-by-factor brought-about-by-factor given-rise-to-by-factor stemmed-from-factor arisen-from-factor derived-from-factor originated-from-factor come-from-factor emerged-from-factor sprung-from-factor flowed-from-factor accorded-to-factor depended-on-by-factor relied-on-by-factor rested-on-by-factor based-on-by-factor grounded-on-by-factor founded-on-by-factor built-on-by-factor constructed-on-by-factor erected-on-by-factor established-on-by-factor set-up-on-by-factor installed-on-by-factor placed-on-by-factor put-on-by-factor laid-on-by-factor settled-on-by-factor located-on-by-factor situated-on-by-factor positioned-on-by-factor stationed-on-by-factor posted-on-by-factor assigned-to-by-factor allotted-to-by-factor apportioned-to-by-factor distributed-to-by-factor given-to-by-factor granted-to-by-factor awarded-to-by-factor conferred-on-by-factor bestowed-on-by-factor presented-to-by-factor offered-to-by-factor proposed-to-by-factor suggested-to-by-factor recommended-to-by-factor advised-to-by-factor counseled-to-by-factor consulted-with-by-factor conferred-with-by-factor discussed-with-by-factor talked-with-by-factor spoken-with-by-factor said-to-by-factor told-to-by-factor informed-of-by-factor notified-of-by-factor reported-to-by-factor announced-to-by-factor proclaimed-to-by-factor published-to-by-factor issued-to-by-factor released-to-by-factor circulated-to-by-factor broadcast-to-by-factor transmitted-to-by-factor sent-to-by-factor dispatched-to-by-factor posted-to-by-factor mailed-to-by-factor shipped-to-by-factor transported-to-by-factor conveyed-to-by-factor delivered-to-by-factor received-at-factor accepted-at-factor taken-at-factor gotten-at-factor obtained-at-factor acquired-at-factor gained-at-factor earned-at-factor won-at-factor achieved-at-factor attained-at-factor reached-at-factor arrived-at-factor come-at-factor approached-at-factor neared-at-factor closed-at-factor ended-at-factor finished-at-factor completed-at-factor concluded-at-factor terminated-at-factor stopped-at-factor ceased-at-factor halted-at-factor paused-at-factor waited-at-factor stayed-at-factor remained-at-factor continued-at-factor persisted-at-factor lasted-at-factor endured-at-factor survived-at-factor lived-at-factor existed-at-factor been-at-factor occurred-at-factor happened-at-factor taken-place-at-factor transpired-at-factor resulted-at-factor ensued-at-factor followed-at-factor succeeded-at-factor preceded-at-factor anteceded-at-factor led-to-at-factor caused-at-factor produced-at-factor effected-at-factor brought-about-at-factor given-rise-to-at-factor stemmed-at-factor arisen-at-factor derived-at-factor originated-at-factor emerged-at-factor sprung-at-factor flowed-at-factor accorded-at-factor depended-at-factor relied-at-factor rested-at-factor based-at-factor grounded-at-factor founded-at-factor built-at-factor constructed-at-factor erected-at-factor established-at-factor set-up-at-factor installed-at-factor placed-at-factor put-at-factor laid-at-factor settled-at-factor located-at-factor situated-at-factor positioned-at-factor stationed-at-factor posted-at-factor assigned-at-factor allotted-at-factor apportioned-at-factor distributed-at-factor given-at-factor granted-at-factor awarded-at-factor conferred-at-factor bestowed-at-factor presented-at-factor offered-at-factor proposed-at-factor suggested-at-factor recommended-at-factor advised-at-factor counseled-at-factor consulted-at-factor discussed-at-factor talked-at-factor spoken-at-factor said-at-factor told-at-factor informed-at-factor notified-at-factor reported-at-factor announced-at-factor proclaimed-at-factor published-at-factor issued-at-factor released-at-factor circulated-at-factor broadcast-at-factor transmitted-at-factor sent-at-factor dispatched-at-factor mailed-at-factor shipped-at-factor transported-at-factor conveyed-at-factor delivered-at-factor
Polistes annularis
Ringed Paper Wasp, Jack Spaniard Wasp, Red Paper Wasp
Polistes annularis is a primitively eusocial paper wasp native to the eastern United States, distinguished by its large size and distinctive red-and-black coloration with a prominent yellow ring on the abdomen. The species exhibits complex social behavior including cooperative nest founding by multiple foundresses, dominance hierarchies, and unique overwintering strategies involving honey storage. Nests are constructed in aggregations under overhangs near water bodies, with colonies typically containing 500 or more cells. Unlike many temperate Polistes species, P. annularis shows relatively robust cold tolerance and has been extensively studied as a model organism for social insect behavior and kin recognition.
social-wasp paper-wasp primitively-eusocial nest-aggregation overwintering honey-storage Müllerian-mimicry foundress-association dominance-hierarchy kin-recognition cold-tolerance model-organism caterpillar-predator riparian-habitat annual-colony-cycle queen-succession cuticular-hydrocarbons subgenus-Aphanilopterus Polistinae Vespidae Hymenoptera eastern-United-States red-and-black-coloration ringed-abdomen orange-antennae cliff-nesting hibernacula usurpation altruism reproductive-competition juvenile-hormone ovarian-development microsatellite-markers maternity-assignment behavioral-ecology social-insect nest-architecture petiole-construction foundress-eviction worker-emergence sexual-dimorphism structural-sex-determination trehalose cold-survival ant-predation parasitoid Elasmus-polistis Chalcoela-iphitalis biological-control pollinator sting-allergen antigen-5 Linnaeus-1763 Fabricius-1804 etymology-Greek-polistes Latin-annularis-ringed
Porcellio
woodlice
Porcellio is a large genus of terrestrial isopods (woodlice) in the family Porcellionidae, containing approximately 191 described species with a near-cosmopolitan distribution. The genus includes the well-studied common rough woodlouse (Porcellio scaber), which has served as a model organism for research on behavioral ecology, personality traits in invertebrates, and physiological processes such as ecdysis. Most species were described by 1950, though new species continue to be discovered. Members of this genus cannot conglobate (roll into a ball), distinguishing them from pill bugs in related genera.
woodlice isopods detritivores terrestrial-crustaceans model-organism
Porcellio laevis
swift woodlouse, smooth slater
Porcellio laevis is a large terrestrial isopod distinguished by its smooth dorsal surface and rapid escape response when disturbed. Native to North Africa, it has achieved cosmopolitan distribution through human-mediated transport and now occurs across Europe, the Americas, Australia, and Pacific islands. The species exhibits direct development with eggs and juveniles brooded in a fluid-filled marsupium, representing extensive parental care among terrestrial arthropods. It is widely kept in captivity due to ease of maintenance and the availability of selectively bred color morphs.
detritivore cosmopolitan model-organism parental-care bioindicator terrarium-culture
Porcellionides pruinosus
Powderblues, powder blue woodlouse
Porcellionides pruinosus is a cosmopolitan terrestrial isopod (woodlouse) native to Europe that has achieved global distribution through human-mediated dispersal. The species is detritivorous and occupies diverse terrestrial habitats from agricultural fields to desert margins. It is suspected to represent a cryptic species complex, with ten subspecies currently recognized and significant morphological and reproductive variation documented across populations. The species carries Wolbachia endosymbionts that can induce feminization of males and cytoplasmic incompatibility, affecting population sex ratios. P. pruinosus has become popular in the pet trade, with numerous color morphs selectively bred.
woodlouse terrestrial-isopod detritivore cosmopolitan Wolbachia cryptic-species-complex model-organism pet-trade
Prenolepis
Winter Ants and Allies
Prenolepis is a genus of ants in the subfamily Formicinae with a wide geographic distribution spanning southeastern Asia, southern China, North America, southern Europe, Anatolia, Cuba, Haiti, and West Africa. The genus is best known for P. imparis, commonly called the winter ant or false honey ant, which exhibits unique cold-adapted activity patterns and serves as a model organism for thermal physiology research. Most Prenolepis species are small, ground-nesting ants that inhabit woodland and forest environments.
ants Formicinae cold-adapted winter-active replete-workers thermal-physiology model-organism ground-nesting mutualism aphid-tending
Procambarus fallax
Slough Crayfish, Deceitful Crayfish
Procambarus fallax is a freshwater crayfish native to peninsular Florida and southern Georgia, USA, where it inhabits tributaries of the Satilla River. The species is notable as the sexual parental species of the parthenogenetic Marmorkrebs (marbled crayfish), which originated as a single lineage from P. fallax through apomictic parthenogenesis. While P. fallax reproduces sexually with separate males and females, its parthenogenetic derivative has achieved global distribution through the aquarium trade and exhibits high invasive potential due to single-female founding capability.
crayfish decapod parthenogenesis invasive-species aquarium-trade ecosystem-engineer Marmorkrebs Florida-endemic Satilla-River Cambaridae freshwater-crustacean asexual-reproduction conservation-biology aquatic-invasive-species model-organism
Prokelisia
delphacid planthoppers
Prokelisia is a genus of delphacid planthoppers in the family Delphacidae, containing approximately five described species. The genus is best known for P. marginata, a salt marsh specialist that exhibits striking wing dimorphism with flightless brachypter and fully winged macropter forms. These planthoppers feed on Spartina cordgrasses and serve as hosts for diverse parasitoid communities including egg parasitoids (Anagrus spp.), nymphal parasitoids (Gonatopus, Neon), and adult parasitoids (Eurypteryx). The genus has become a model system for studying the evolution and maintenance of dispersal polymorphisms in heterogeneous environments.
planthopper salt-marsh wing-dimorphism Spartina dispersal-polymorphism parasitoid-host model-organism invasive-species phenotypic-plasticity brachypter macropter delphacid Hemiptera enemy-release habitat-tracking
Protopiophila litigata
Antler Fly
Protopiophila litigata, commonly called the antler fly, is a small piophilid fly endemic to North America. The species is distinguished by its exclusive reliance on discarded cervid antlers as a breeding substrate—a highly unusual and ephemeral resource that has driven the evolution of extreme territorial behavior and lifelong site fidelity in males. Males defend territories on antlers with remarkable aggression, engaging in frequent combat with rivals and even attacking much larger insects. This unique ecology has made P. litigata a model organism for studying senescence, sexual selection, and life history trade-offs in wild insect populations.
territoriality site-fidelity senescence sexual-selection chemical-ecology nutrient-cycling model-organism
Publilia concava
Aster Treehopper
Publilia concava is an eastern North American treehopper (Hemiptera: Membracidae) commonly occurring in large aggregations on goldenrod (Solidago spp.). Adults oviposit in early June; nymphs hatch by late June and aggregations peak in mid-July. The species forms dense aggregations of up to 500+ individuals on single plant ramets. It is obligately associated with tending ants, primarily Formica subsericea, Camponotus noveboracensis, and Lasius species, which defend treehoppers from natural enemies in exchange for honeydew. Feeding causes leaf damage including drooping and premature browning. The species is a model system for studying ant-hemipteran mutualisms and spatial ecology.
treehopper Membracidae ant-tended myrmecophile mutualism goldenrod Solidago aggregation-behavior model-organism eastern-North-America
Pyrrhocoris
firebugs, cotton stainers
Pyrrhocoris is a genus of true bugs in the family Pyrrhocoridae, commonly known as firebugs or cotton stainers. The genus contains approximately eight described species, with Pyrrhocoris apterus (the firebug) being the most extensively studied. Species in this genus are primarily distributed across the Palaearctic realm, with some records from North America and East Asia. The genus is notable for its gregarious behavior and has served as an important model organism in studies of insect behavioral ecology, developmental plasticity, and wing polymorphism.
Heteroptera Pyrrhocoridae model-organism wing-polymorphism animal-personality gregarious-behavior Palaearctic
Pyrrhocoris apterus
firebug, European firebug
Pyrrhocoris apterus, commonly known as the firebug or European firebug, is a striking true bug recognized by its vivid red and black coloration. Native to the Palaearctic region, it has expanded its range to North America, Central America, India, and Australia. The species exhibits pronounced gregarious behavior, with larvae and adults frequently forming aggregations of tens to hundreds of individuals. It is primarily seed-feeding, specializing on lime tree and mallow seeds. A notable feature is its non-functional wing polymorphism: populations contain rare long-winged (macropterous) individuals alongside the typical short-winged (brachypterous) form, though the species is effectively flightless.
gregarious seed-feeder wing-polymorphism aggregation introduced-species model-organism
Sancassania
Sancassania is a genus of mites in the family Acaridae containing more than 80 species. Many species are associated with fungi, particularly mushrooms, with some lineages having specialized to exploit this ephemeral resource. Other species are phoretic on beetles or occur in soil and decomposing organic matter. The genus includes economically significant species associated with agricultural crops and biocontrol systems.
mites acaridae mycophagous phoretic male-dimorphism sexual-conflict soil-fauna agricultural-pest model-organism
Scaptomyza flava
European leaf miner, yellow scaptomyza
Scaptomyza flava is an obligate herbivorous leaf-mining fly in the family Drosophilidae, representing an evolutionary transition to herbivory from the ancestral microbe-feeding habit of drosophilids. Adults are 2.5 mm in length and amber to dark brown in color. The species is native to the Palearctic region with a Holarctic distribution across Europe, Asia, and North America, and has been introduced to New Zealand and Australia where it is a significant agricultural pest of Brassicales crops. Larvae feed internally on leaf mesophyll, creating serpentine mines that mature into blotches. The species is unusual among Drosophilidae in having lost yeast-associated odorant receptors and evolved specialized detoxification mechanisms for mustard oils. It is being developed as a model organism for studying plant-herbivore interactions.
leaf-miner herbivore agricultural-pest brassica-pest model-organism invasive-species Drosophilidae evolutionary-biology chemical-ecology biological-control
Scathophaga
Dung Flies, Yellow Dung Flies
Scathophaga is a genus of small to medium-sized predatory flies in the family Scathophagidae, commonly known as dung flies. The genus includes approximately 99 described species, with Scathophaga stercoraria (the yellow dung fly) being the most extensively studied as a model organism in behavioral ecology and evolutionary biology. Adults are typically found in association with animal dung, where they engage in complex mating systems involving intense male-male competition and female mate choice. Larvae develop within dung or decaying organic matter, where they feed predaciously on other insect larvae.
Diptera Scathophagidae dung-flies predatory-flies sexual-selection sperm-competition model-organism cryptic-female-choice behavioral-ecology coprophilous-insects
Scathophaga stercoraria
yellow dung fly, golden dung fly
Scathophaga stercoraria, commonly known as the yellow dung fly or golden dung fly, is a widespread and abundant dipteran species found across the Northern Hemisphere. Adults are sexually dimorphic: males display bright golden-yellow coloration with orange-yellow fur on the front legs, while females are duller with green-brown tinges and lack the brightly colored leg fur. The species is strongly associated with the dung of large mammals, where it breeds and where males establish territories to intercept females. Adults are predatory, feeding on smaller insects and occasionally nectar, while larvae are coprophagous, developing within dung. The species has become an important model organism in evolutionary biology, particularly for studies of sexual selection, sperm competition, and life history evolution.
dung-fly sexual-selection model-organism coprophagy predatory-fly pasture-ecosystem sexual-dimorphism sperm-competition
Schizocosa ocreata
Brush-legged Wolf Spider, Brush-legged Split Wolf Spider
A medium-sized wolf spider native to eastern and central North America, distinguished by prominent sexual dimorphism. Males possess conspicuous dark bristle tufts on their forelegs used in courtship displays, while females lack these ornamentations. The species has become a model organism for studies of multimodal sexual communication, sexual selection, and predator-prey interactions involving visual signaling.
wolf-spider sexual-dimorphism multimodal-communication sexual-selection cursorial-predator model-organism predator-prey-interactions sexual-cannibalism
Sciara
fungus gnats
Sciara is a genus of fungus gnats in the family Sciaridae. The genus has been extensively studied for its unusual genetics, particularly the selective elimination of paternal chromosomes during early embryonic development. Species in this genus are small, delicate flies associated with moist environments rich in organic matter.
fungus-gnats sciaridae model-organism chromosome-elimination mushroom-pests
Serinethinae
soapberry bugs
Serinethinae is a subfamily of true bugs (Hemiptera: Rhopalidae) comprising approximately 65 species across three genera: Jadera, Leptocoris, and Boisea. These insects are seed specialists on plants in the soapberry family (Sapindaceae), including maples, balloon vines, and soapberry trees. They have become a classic study system for rapid evolutionary adaptation, particularly documented in response to introduced host plants. The subfamily exhibits bright coloration and has undergone adaptive radiation correlated with their host plant relationships.
seed-predator Sapindaceae-specialist adaptive-radiation rapid-evolution model-organism contemporary-evolution host-race-formation anthropogenic-evolution nuisance-pest
Sinella curviseta
Sinella curviseta is a slender springtail in the family Entomobryidae, widely used as a model organism in soil ecology and ecotoxicology. The species produces curvisetone, a male-specific tricyclic nor-diterpenoid with an unprecedented carbon skeleton, which peaks before oviposition and may function in reproductive communication. It is among the most abundant soil arthropods in many temperate ecosystems.
model-organism fungivore soil-arthropod chemical-ecology pheromone
Speyeria cybele
Great Spangled Fritillary
Speyeria cybele, the great spangled fritillary, is a large brush-footed butterfly native to North America. Adults have a wingspan of 2.25 to 4 inches, with orange-brown upper wings marked by black chevrons and distinctive silvery spots on the undersides. The species exhibits pronounced geographic variation: eastern populations are more orange, while western populations are browner. Females are slightly darker than males and have longer lifespans, often surviving into October. The butterfly has an obligate relationship with violets (Viola spp.) as larval host plants. Research has demonstrated that S. cybele relies primarily on vision for habitat detection and navigation, with flash-blinded individuals showing 30 times lower success in locating habitat patches.
butterfly Nymphalidae fritillary North-America violet-specialist visual-navigation pollinator model-organism postage-stamp dispersal-ecology metapopulation flash-blindness habitat-detection diapause univoltine meadow-habitat prairie conservation-biology Lepidoptera Speyeria great-spangled-fritillary
Stenomacra marginella
bordered plant bug
Stenomacra marginella is a bordered plant bug in the family Largidae, found across the Americas from North America through Central America to South America. The species has been documented feeding on various plants including Seep Willow (Baccharis salicifolia) and Mexican sunflower (Tithonia diversifolia). Research has examined male copulatory behavior and its effects on reproduction. The species serves as a host for parasitoids and has been observed in high abundance in riparian habitats.
Hemiptera Heteroptera Largidae plant-bug bordered-plant-bug Americas riparian omnivore sexual-selection model-organism
Tanytarsus
non-biting midge
Tanytarsus is a large genus of non-biting midges comprising over 480 described species. The genus belongs to the tribe Tanytarsini within the subfamily Chironominae. Larvae occur in diverse freshwater habitats, with some species inhabiting marine environments. Species-level studies reveal complex life cycles with photoperiod and temperature as key determinants of seasonal patterns.
chironomid non-biting-midge freshwater marine model-organism parthenogenesis diapause toxicology Belgium Colombia Ecuador Brazil Finland Neotropical Palearctic Nearctic trivoltine COI-barcode hypopygium species-groups aquatic-macrophytes trout-ponds pH-sensitivity
Tegeticula
yucca moths
Tegeticula is a genus of moths in the family Prodoxidae, commonly known as yucca moths. These insects are obligate mutualistic pollinators of various Yucca and Hesperoyucca species, representing one of the classic examples of coevolution between plants and insects. The genus includes both pollinating species and derived 'cheater' species that do not pollinate their hosts. Female moths possess specialized tentacles for collecting and depositing pollen, and their ovipositors are adapted to specific host plant structures.
mutualism pollination coevolution obligate-mutualism desert-ecology cryptic-species model-organism
Temnothorax
Acorn Ants and Allies
Temnothorax is a genus of small ants in the subfamily Myrmicinae containing over 500 species worldwide. Workers are typically small with mesosoma length around 0.7–1.5 mm. Colonies are generally monogynous with small populations, often fewer than 100 workers, though some species maintain multiple satellite nests. The genus has become an important model system for studying social behavior, caste differentiation, and collective decision-making in ants due to their small colony size and ease of laboratory maintenance.
ants social-insects model-organism myrmicinae acorn-ants
Temnothorax curvispinosus
acorn ant, Bent-spined Acorn Ant
Temnothorax curvispinosus is a small cavity-nesting ant species common throughout the eastern United States. The species is frequently called the "acorn ant" due to its habit of nesting in hollowed-out acorns and other small plant cavities. Colonies exhibit sophisticated collective decision-making when selecting nest sites, with active workers recruiting nestmates through quality-dependent delays and quorum-based transport strategies. The species has been used as a model organism for studying social insect behavior, micronutrient dynamics, and urban thermal adaptation.
acorn-ant cavity-nesting-ant model-organism collective-behavior urban-evolution thermal-adaptation micronutrient-ecology nest-site-selection social-insect Myrmicinae
Temnothorax longispinosus
Long-spined Acorn Ant
Temnothorax longispinosus is a small North American ant species, measuring 2–2.5 mm in length, commonly known as the Long-spined Acorn Ant. It inhabits forest environments and nests primarily in preformed cavities within leaf litter, including hollow nuts and acorns. The species exhibits remarkable queen polymorphism with three distinct morphs associated with alternative nest-founding strategies: small queens with reduced flight capacity that practice dependent colony founding by returning to natal nests; large queens with low fat reserves that found colonies via pleometrosis (cooperative founding with multiple queens); and large queens with high fat reserves that practice haplometrosis (solitary founding). This species serves as a host for the slave-making ant Protomognathus americanus and has been extensively studied for its genomic adaptations to climate variation and parasite pressure.
acorn-ant queen-polymorphism social-parasite-host forest-ant cavity-nester model-organism slave-making-ant-host North-American-native
Temnothorax rugatulus
Western Acorn Ant
Temnothorax rugatulus is a small myrmicine ant species native to western North America, notable for its sophisticated collective decision-making behaviors and remarkable polymorphism in queen size. The species exhibits two distinct queen morphs: large macrogynes associated with single-queen (monogynous) colonies, and smaller microgynes found in multiple-queen (polygynous) colonies. This species has become an important model organism for studying social insect behavior, communication, and the molecular mechanisms underlying caste determination and phenotypic plasticity.
model-organism social-insect behavioral-ecology collective-decision-making caste-polymorphism epigenetics alarm-communication quorum-sensing cavity-nesting-ant western-North-America
Tenebrio
Mealworms
Tenebrio is a genus of darkling beetles (family Tenebrionidae) containing approximately 11 extant species, including the widely known yellow mealworm (T. molitor) and dark mealworm (T. obscurus). Adults measure 12–18 mm in length and have a lifespan of 1–2 years. The larvae, commonly called mealworms, are minor pests of stored grain products but are also extensively reared commercially as food for pets, livestock, fish bait, and increasingly as a protein source for human consumption and animal feed.
stored-product-pest commercially-reared alternative-protein decomposer model-organism
Tenebrio molitor
Yellow Mealworm Beetle, Mealworm Beetle, Yellow Mealworm
Tenebrio molitor, the yellow mealworm beetle, is a darkling beetle (Tenebrionidae) whose larvae are widely known as mealworms. Adults measure 12–25 mm in length, significantly smaller than the related superworm beetle Zophobas morio. The species has been mass-produced since the 1950s for fish bait, pet food, and backyard bird feeding. In January 2021, the European Union approved yellow mealworms for human consumption, marking a milestone for the edible insect industry. Research continues on optimizing rearing methods, with eight-year selection programs demonstrating 75% increases in pupal size.
stored-product-pest edible-insect biodegradation mass-rearing alternative-protein feed-insect darkling-beetle model-organism
Tenebrioninae
darkling beetles (subfamily)
Tenebrioninae is the largest subfamily of darkling beetles (Tenebrionidae), containing more than 20 tribes and including economically significant species such as flour beetles (Tribolium spp.) and the yellow mealworm (Tenebrio molitor). Following a major 2021 taxonomic revision, approximately half of the former species diversity was moved to the resurrected subfamily Blaptinae. The subfamily includes both stored-product pests and species used as feeder insects for reptiles and amphibians.
darkling-beetle flour-beetle mealworm stored-product-pest feeder-insect model-organism
Theridiidae
tangle-web spiders, cobweb spiders, comb-footed spiders
Theridiidae is a large, globally distributed family of araneomorph spiders comprising over 2,600 species in more than 130 genera. Members are characterized by a comb of serrated bristles (setae) on the tarsus of the fourth leg, used to manipulate silk. The family exhibits remarkable diversity in web architecture, ranging from irregular tangle webs to specialized gumfoot webs and sheet-like structures. Theridiids are ecribellate, producing sticky capture silk rather than woolly silk, and are entelegyne with females possessing a genital plate. The family includes medically significant species such as widow spiders (Latrodectus), model organisms for social behavior research (Anelosimus), and specialized kleptoparasites (Argyrodinae).
Araneae Araneomorphae ecribellate entelegyne synanthropic kleptoparasitic social-spiders medically-significant model-organism invasive-species cave-adapted ant-specialist
Theridion
tangle-web spiders
Theridion is a large genus of tangle-web spiders (family Theridiidae) with nearly 600 described species distributed worldwide. The genus has historically served as a wastebasket taxon for theridiid species lacking a colulus that did not fit into other genera. Notable species include T. grallator, the Hawaiian happy face spider, recognized for its distinctive abdominal color patterns, and T. nigroannulatum, one of few spider species known to live in social groups and hunt cooperatively. Molecular studies have revealed that Theridion as traditionally defined is para- or polyphyletic, with Hawaiian representatives representing at least two independent colonization events from different continental sources.
Theridiidae tangle-web-spiders cobweb-weavers social-spiders Hawaiian-fauna model-organism phylogenetics web-building-behavior
Timema
Timemas
Timema is a genus of small, wingless stick insects representing the sole extant member of the family Timematidae and suborder Timematodea. Native to mountainous regions of western North America, these insects are considered the sister group to all other stick insects, making them evolutionarily significant as a basal lineage. The genus exhibits remarkable diversity in reproductive mode, with five of twenty-one species being parthenogenetic, including two species that have reproduced asexually for over one million years—the longest known asexual period for any insect. Timema species display sophisticated cryptic coloration matching their host plants, with color morphs including green, gray, brown, and striped variants that have been extensively studied as models for ecological speciation and natural selection.
stick-insect walking-stick cryptic-coloration parthenogenesis ecological-speciation basal-lineage wingless chaparral nocturnal model-organism
Tribolium
flour beetles
Tribolium is a genus of beetles in the family Tenebrionidae, commonly known as flour beetles. Several species are major pests of stored grain products worldwide, particularly Tribolium castaneum (red flour beetle) and Tribolium confusum (confused flour beetle). The genus has also become an important model organism in developmental biology and genetics research due to its ease of laboratory rearing and amenability to RNA interference techniques.
stored-product-pest model-organism agricultural-pest RNAi developmental-biology grain-pest pantry-pest cosmopolitan-pest
Tribolium castaneum
Red Flour Beetle, Rust-red Flour Beetle
Tribolium castaneum, the red flour beetle, is a cosmopolitan pest of stored grain products and a well-established model organism for genetic and developmental research. Adults are small, reddish-brown beetles approximately 3–4 mm in length. The species is notable for its amenability to RNA interference techniques, making it valuable for studying segmentation, body plan development, and gene function. In stored product environments, it causes significant economic damage to flour, cereals, pasta, and other dry goods. Females are polyandrous, mating with multiple males.
stored-product-pest model-organism RNAi developmental-biology pantry-pest grain-pest economic-pest
Tribolium destructor
destructive flour beetle, dark flour beetle
Tribolium destructor is a stored product pest in the family Tenebrionidae, commonly known as the destructive or dark flour beetle. It infests stored flour, grain, and other dried starchy materials. Research has examined its reproductive biology, including effects of food quality and mating frequency on fecundity. Its larvae serve as hosts for the gregarine parasite Gregarina confusa, and the species has been used in studies of host-parasite interactions under nutritional stress.
stored-product-pest flour-beetle grain-pest gregarine-host model-organism
Trirhabda pilosa
Trirhabda pilosa is a skeletonizing leaf beetle in the family Chrysomelidae, native to North America. The species is a specialist herbivore of sagebrush (Artemisia spp.) and has been extensively used in ecological research as a model organism to study plant-to-plant communication and induced plant resistance. Larvae demonstrate consistent behavioral avoidance of leaves exposed to damage cues, making them valuable for rapid bioassays of plant defensive responses.
leaf-beetle Chrysomelidae sagebrush-specialist herbivore induced-resistance plant-plant-communication bioassay model-organism Artemisia North-America
Tupiocoris notatus
Suckfly
Tupiocoris notatus is a small mirid bug (2–3 mm) specializing on Solanaceae host plants. It feeds on mesophyll cell contents of plants such as Datura wrightii and Nicotiana attenuata. The species undergoes incomplete metamorphosis with multiple nymph stages. It has become an important model organism for studying plant-herbivore chemical ecology and host plant-specific transcriptional responses.
model-organism pest herbivore chemical-ecology genomics
Uloborus
Feather-legged Spiders, Featherlegged Orb-weavers, Hackled Band Orb-weavers
Uloborus is a genus of cribellate orb-weaving spiders in the family Uloboridae, comprising approximately 72 described species. These small spiders (3–6 mm body length) are unique among orb-weavers in lacking venom glands entirely, instead relying on constriction and digestive enzymes to subdue prey. They construct small horizontal orb-webs with hackled, non-sticky silk produced by a specialized cribellum organ, often incorporating a stabilimentum—a thickened linear or zigzag silk band at the web hub. The genus is predominantly tropical and subtropical in distribution, with only a few species extending into temperate North America and Europe.
cribellate non-venomous orb-weaver stabilimentum model-organism