Cytogenetics

Guides

Aclerda
flat grass scales
Aclerda is a genus of scale insects (family Aclerdidae) commonly known as flat grass scales. Species in this genus are legless as adults, with strongly reduced 1-segmented antennae and a unique anal apparatus. They inhabit leaf sheaths of grasses in hot, dry regions. The genus includes both sexually and parthenogenetically reproducing species, with unusual cytogenetic systems including heterochromatinization of one haploid chromosome set in males of some species.
scale-insects grass-pests sugarcane-pest ovoviviparity parthenogenesis cytogenetics Aclerdidae Hemiptera
Agallia constricta
Constricted Leafhopper
Agallia constricta is a leafhopper species in the family Cicadellidae, commonly known as the Constricted Leafhopper. The species has been documented across much of the eastern and central United States. It possesses distinctive cytogenetic characteristics, including holokinetic chromosomes with diffuse kinetochores distributed along the chromosome length rather than localized at a centromere, as demonstrated in cell line AC-20 studies. This chromosomal architecture results in unique mitotic behavior where chromatin moves as unified plates during anaphase.
leafhopper cytogenetics holokinetic-chromosomes cell-line-model
Boreonectes
Boreonectes is a genus of small predaceous diving beetles established by Angus in 2010, comprising approximately 16 described species. The genus was separated from Deronectes based on morphological and cytogenetic evidence. Species occur across North America, the Neotropics, and the Palearctic, with West European species showing distinct chromosomal differentiation despite minimal genetic divergence. These beetles occupy cold-water habitats including mountain lakes and barren pools, with some species extending to Arctic Scandinavia.
cytogenetics glacial-refugia post-glacial-colonization mountain-lakes cold-water-habitats
Brachystola magna
Plains Lubber Grasshopper, Western Lubber Grasshopper, Homesteader
Brachystola magna is one of the largest grasshoppers in North America, a flightless species inhabiting the Great Plains from the Canadian border to central Mexico. Adults reach 4–6 cm in length, with females substantially larger and heavier than males. The species exhibits a two-year life cycle, with eggs overwintering twice before hatching. Though primarily herbivorous, adults display notable omnivory including scavenging and predation on other insects. The species has historical scientific significance as the subject of Walter Sutton's pioneering work on reduction division and chromosome theory.
grasshopper lubber flightless Great-Plains Romaleidae polyphagous omnivorous two-year-life-cycle semivoltine cytogenetics agricultural-pest intermediate-host thermoregulation
Chironomus atrella
Chironomus atrella is a non-biting midge species in the family Chironomidae, studied primarily through cytogenetic analysis of its polytene chromosomes. Research has clarified taxonomic confusion surrounding this name, which had been applied to at least two distinct species. Populations across North America show moderate to high chromosomal polymorphism, with heterozygosity ranging from 0.36 to 0.92 in different habitats. The species has been documented in both shallow freshwater environments and tidal coves.
non-biting-midge cytogenetics polytene-chromosomes North-America chromosomal-polymorphism tidal-cove phylogeography
Circotettix
Circotettix is a genus of band-winged grasshoppers in the family Acrididae, containing approximately 9-10 described species. The genus is notable for its cytogenetic characteristics, with several species studied for chromosomal variations that correlate with geographic distribution. Species within this genus are distributed across western North America, with records from Arizona, California, Colorado, Idaho, and Kansas. Some species, such as C. rabula, have been subjects of thermal behavior studies examining altitudinal variation.
band-winged-grasshopper cytogenetics western-North-America strong-flier Oedipodinae Trimerotropini
Cyphomyrmex
fungus-growing ants
Cyphomyrmex is a genus of small, drab-colored fungus-growing ants in the tribe Attini, found primarily in the Neotropics. These ants cultivate fungi in the tribe Leucocoprineae as their primary food source, with most species growing fungal nodules rather than full mycelial gardens. Colonies are typically monogynous and small, rarely exceeding 500 workers. The genus is divided into two species complexes: the strigatus complex (South America only) and the rimosus complex (southern North America to South America). Cyphomyrmex represents a basal lineage among attine ants and serves as sister group to Mycetophylax.
fungus-growing-ants attine-ants Myrmicinae Neotropical mutualism fungiculture Leucocoprineae monogyny parasitoid-wasps social-parasitism chemical-ecology alkaloid-venom nest-architecture behavioral-plasticity cytogenetics chromosome-evolution Guiana-Shield Brazil Panama Puerto-Rico Mesoamerica Argentina United-States Texas California Florida yeast-gardens mycelial-gardens rimosus-complex strigatus-complex age-polyethism trophallaxis thanatosis feigning-death Diapriidae Acanthopria Mimopriella Megalomyrmex social-parasite C.-longiscapus C.-transversus C.-laevigatus C.-rimosus C.-minutus C.-lectus C.-cornutus C.-costatus pheromones 3-octanol farnesenes trail-following alarm-signal diketopiperazines antifungal-compounds defensive-behavior colony-defense flight-response recruitment Lanchester's-laws karyotype chromosome-number rDNA microsatellites FISH chamber-depth gallery-length fire-disturbance savanna-forest-transition arboreal-nesting clay-auricles soil-nests wood-nests epiphytic-nests moss-nests coconut-nests desiccation-susceptibility moist-habitats basal-attine phylogenetics sister-group chemical-evolution venom-alkaloids behavioral-manipulation host-parasite-interaction ecosystem-engineering nutrient-cycling decomposition organic-matter insect-feces exoskeleton-substrate garden-transplantation worker-polymorphism queen-number dealate-queens alates brood-care ecdysis-assistance foraging sugar-collection plant-exudates fungal-domestication nodule-cultivation mycelium-cultivation agricultural-behavior nest-entrance funnel-structure exposed-gardens symbiont-diversity geographic-variation research-model evolutionary-biology mutualism-evolution ant-fungus-coevolution chemical-communication social-insects eusociality colony-size small-colonies slow-movement crypsis debris-mimicry predation-avoidance parasitoid-defense wasp-killing colony-abandonment resource-rescue thief-ant-defense venom-resistance toxicity-tolerance behavioral-suppression playing-dead alkaloid-manipulation fungal-secondary-metabolites antibacterial-compounds antiviral-compounds garden-protection microbial-defense nest-microclimate temperature-regulation humidity-requirements depth-effects fire-adaptation disturbance-ecology habitat-specificity substrate-specialization clay-construction soil-manipulation architectural-plasticity vertical-nesting embankment-nesting overhang-nesting pendant-nests swallow-nest-mimicry research-accessibility field-biology tropical-ecology Neotropical-myrmecology biodiversity conservation invasive-species-context native-species biological-control Integrated-Pest-Management agricultural-ecology forest-ecology savanna-ecology transitional-habitats disturbed-areas urban-ecology anthropogenic-impact climate-sensitivity habitat-limitation range-boundaries dispersal colonization establishment population-dynamics demography colony-density nest-spacing intraspecific-competition interspecific-competition territoriality resource-defense combat-behavior aggression-levels recruitment-behavior chemical-signaling alarm-pheromones trail-pheromones recognition-cues cuticular-hydrocarbons venom-composition defensive-secretions mandibular-glands Dufour's-gland metapleural-glands antibiotic-production grooming-behavior fungal-inoculation integumental-fungi yeast-growth larval-grooming garden-maintenance substrate-preparation fecal-fertilizer anal-trophallaxis crop-regurgitation fluid-application drying-behavior nodule-formation transplantation-behavior garden-establishment ceiling-gardens root-association architectural-innovation nest-site-selection microhabitat-choice moisture-requirements thermal-buffering predator-avoidance parasite-avoidance disease-resistance social-immunity collective-behavior division-of-labor task-allocation temporal-polyethism worker-age nurse-workers forager-workers soldier-caste-absence monomorphism worker-size-variation queen-worker-differentiation reproductive-caste gyne-production male-production seasonal-reproduction colony-founding claustral-founding non-claustral-founding fungal-inoculum founding-queen first-worker-generation nutritional-dependency fat-reserves metabolic-adaptation digestive-physiology enzyme-complement fungal-enzyme lignocellulose-degradation nutritional-mutualism obligate-mutualism vertical-transmission horizontal-transmission symbiont-switching cultivar-replacement garden-failure colony-mortality population-turnover generation-time longevity survivorship life-expectancy aging senescence reproductive-investment colony-growth colony-decline budding fission reproduction-mode genetic-structure relatedness mating-system nuptial-flight mate-choice sperm-storage colony-odor nestmate-recognition foreign-rejection agonistic-behavior territorial-marking boundary-defense raiding-behavior robbing-behavior cleptobiosis dulosis slavery inquilinism guest-ants myrmecophiles nest-associates commensalism inquilines parasite-tolerance host-manipulation venom-alkaloid pyrrolidine indolizidine piperidine nonanal farnesene sesquiterpene agriculture-chemical gaster-extract chemical-diversity chemical-simplicity evolutionary-precursor derived-chemistry biosynthetic-pathway semiochemical infochemical communication information-transfer colony-organization social-structure polygyny queen-condition dealation wing-shedding ovarian-development fecundity egg-laying brood-development developmental-rate temperature-dependence humidity-dependence food-availability nutritional-quality fungal-productivity garden-yield worker-production colony-efficiency energy-allocation resource-allocation foraging-efficiency search-behavior prey-detection food-retrieval transport-behavior load-size travel-speed path-integration orientation navigation homing-behavior learning memory experience individual-recognition context-dependent-behavior threat-assessment risk-management predator-inspection alarm-propagation recruitment-activation mobilization colony-response emergency-behavior panic-response controlled-response defensive-strategy offensive-strategy escalation de-escalation conflict-resolution fight-avoidance retreat-behavior surrender-signal dominance-hierarchy reproductive-skew worker-policing queen-policing egg-eating oviposition-suppression reproductive-conflict kin-conflict worker-reproduction male-production-by-workers anarchy social-parasitism-detection parasite-recognition enemy-recognition nest-intrusion nest-defense perimeter-defense chamber-defense brood-defense queen-defense self-sacrifice suicidal-defense autothysis sting-use mandible-use spraying-behavior gaster-flexion chemical-defense mechanical-defense armor cuticle-thickness pigmentation masquerade mimicry Batesian-mimicry Muellerian-mimicry aggressive-mimicry Wasmannian-mimicry myrmecophily myrmecophagy ant-plant-mutualism trophobiosis extrafloral-nectary domatia plant-ant-interaction herbivore-defense seed-dispersal pollination ecosystem-service functional-role trophic-position detritivore decomposer saprotroph necrotroph fungivore omnivore predator scavenger trophic-level energy-flow carbon-cycling nitrogen-cycling phosphorus-cycling soil-formation bioturbation aeration water-infiltration microbial-community bacteria actinomycetes Pseudonocardia disease-suppression garden-hygiene weeding-behavior pruning-behavior fungal-grooming antibiotic-application mutualist-protection agricultural-disease crop-pathology escovopsis garden-parasite competitor-fungus pathogen-defense immune-response individual-immunity grooming allogrooming self-grooming nest-cleaning refuse-management fecal-management waste-disposal midden-formation territory-size home-range foraging-range recruitment-range exploration exploitation information-use public-information private-information cue-use signal-use communication-network interaction-network social-network colony-network population-network community-ecology species-interaction apparent-competition exploitative-competition interference-competition resource-partitioning niche-differentiation habitat-filtering environmental-gradient altitudinal-distribution latitudinal-distribution continental-distribution island-distribution endemism biogeography phylogeography historical-biogeography vicariance range-expansion range-contraction refugia glacial-cycles climate-change-impact habitat-fragmentation deforestation land-use-change agricultural-intensification urbanization pollution pesticide-exposure heavy-metal-accumulation conservation-status population-viability extinction-risk protected-area reserve-design habitat-corridor connectivity metapopulation source-sink-dynamics rescue-effect mass-effect ecological-theory behavioral-ecology evolutionary-ecology functional-ecology trait-based-ecology comparative-analysis phylogenetic-comparative-methods character-evolution ancestral-state-reconstruction convergent-evolution parallel-evolution adaptive-radiation species-diversification speciation hybridization introgression gene-flow genetic-differentiation population-structure molecular-ecology genomics transcriptomics proteomics metabolomics volatile-organic-compound cuticular-hydrocarbon glandular-secretion sting-apparatus mandible-morphology head-morphology mesosomal-morphology petiolar-morphology gastral-morphology leg-morphology antennal-morphology sensilla chemoreception mechanoreception thermoreception photoreception vision compound-eye ocelli brain-morphology neuroanatomy learning-capacity memory-capacity cognitive-ability problem-solving tool-use sequence-learning route-learning spatial-memory temporal-memory social-learning cultural-transmission tradition colony-personality behavioral-syndrome boldness exploration-tendency activity-level aggression-level foraging-tendency defensive-tendency stress-response physiological-stress thermal-stress desiccation-stress starvation-stress immune-challenge wound-healing metabolic-rate respiration energy-expenditure water-balance osmoregulation excretion Malpighian-tubules rectum hindgut midgut foregut crop proventriculus digestive-enzyme nutrient-absorption lipid-metabolism carbohydrate-metabolism protein-metabolism amino-acid-metabolism nitrogen-excretion uric-acid urea ammonia osmolyte cryoprotectant heat-shock-protein stress-protein antioxidant-defense oxidative-stress reactive-oxygen-species aging-biology senescence-theory disposable-soma antagonistic-pleiotropy mutation-accumulation life-history-theory r-K-selection bet-hedging iteroparity semelparity reproductive-effort parental-investment maternal-effect paternal-effect epigenetics DNA-methylation histone-modification non-coding-RNA gene-regulation transcription-factor signaling-pathway hormone juvenile-hormone ecdysone insulin-signaling TOR-signaling nutrient-sensing reproductive-signaling caste-determination sex-determination environmental-sex-determination genetic-sex-determination haplodiploidy arrhenotoky thelytoky parthenogenesis arrhenotokous-parthenogenesis automixis apomixis central-fusion terminal-fusion genomic-imprinting parental-conflict kin-selection inclusive-fitness Hamilton's-rule relatedness-asymmetry sex-ratio-theory local-mate-competition local-resource-competition local-resource-enhancement split-sex-ratio worker-sex-ratio queen-sex-ratio colony-sex-ratio population-sex-ratio operational-sex-ratio effective-population-size genetic-drift inbreeding inbreeding-depression outbreeding outbreeding-depression heterosis hybrid-vigor genetic-load mutation-rate effective-number-of-codons codon-usage-bias GC-content genome-size karyotype-evolution chromosomal-rearrangement fusion inversion translocation polyploidy aneuploidy chromosomal-polymorphism rDNA-cluster heterochromatin euchromatin centromere telomere nucleolus-organizer-region satellite-DNA minisatellite microsatellite simple-sequence-repeat transposable-element retrotransposon DNA-transposon horizontal-gene-transfer endosymbiont Wolbachia Cardinium Rickettsia Spiroplasma bacterial-symbiont fungal-symbiont viral-symbiont parasite pathogen disease epidemiology transmission-dynamics virulence resistance tolerance recovery immunity vaccination prophylaxis medicinal-behavior self-medication thermoregulation behavioral-thermoregulation social-thermoregulation microclimate-selection nest-temperature brood-temperature fungal-garden-temperature metabolic-heat heat-dissipation evaporative-cooling behavioral-cooling fanning ventilation chamber-design gallery-design entrance-design air-flow humidity-regulation water-collection water-storage desiccation-resistance cuticular-waterproofing spiracle-control respiratory-water-loss excretory-water-loss water-recycling metabolic-water dietary-water environmental-water rainfall-dependence seasonal-activity dry-season wet-season monsoon drought flood fire disturbance succession primary-succession secondary-succession climax-community pioneer-species habitat-specialist habitat-generalist edge-species interior-species gap-species canopy-species understory-species ground-species subterranean-species arboreal-species liana-species epiphyte-species lithophyte-species rheophyte-species aquatic-margin-species terrestrial-species fossorial-species cursorial-species scansorial-species volant-species winged-reproductive dealate ergatoid brachypterous apterous polymorphism caste-polymorphism queen-polymorphism male-polymorphism size-polymorphism allometry isometry shape-variation morphological-integration modularity evolvability constraints developmental-stability fluctuating-asymmetry directional-asymmetry antisymmetry phenotypic-plasticity reaction-norm genotype-environment-interaction grandparental-effect indirect-genetic-effect social-environment-effect colony-effect density-dependence frequency-dependence negative-frequency-dependence positive-frequency-dependence apostatic-selection anti-apostatic-selection search-image predator-learning prey-learning friend-recognition cuticular-hydrocarbon-profile gestalt-odor colony-specific-odor individual-specific-odor task-specific-odor age-specific-odor reproductive-odor queen-odor queen-pheromone primer-pheromone releaser-pheromone signal-pheromone modulatory-pheromone alarm-pheromone trail-pheromone recruitment-pheromone aggregation-pheromone sex-pheromone marking-pheromone territorial-pheromone defensive-pheromone poison-gland Dufour-gland mandibular-gland postpharyngeal-gland metapleural-gland sternal-gland tarsal-gland anal-gland rectal-gland pygidial-gland mandibular-brush tibial-spur stridulatory-organ subgenual-organ Johnston's-organ tympanal-organ hair-sensillum campaniform-sensillum basiconic-sensillum coeloconic-sensillum placoid-sensillum sensilla-trichodea sensilla-basiconica sensilla-coeloconica sensilla-ampullacea sensilla-campaniformia sensilla-placodea olfactory-receptor-neuron gustatory-receptor-neuron mechanoreceptor-neuron thermoreceptor-neuron hygroreceptor-neuron photoreceptor-neuron visual-processing olfactory-processing gustatory-processing mechanosensory-processing central-complex mushroom-body antennal-lobe optic-lobe suboesophageal-ganglion ventral-nerve-cord sympathetic-nervous-system neurosecretion neurohemal-organ corpus-cardiacum corpus-allatum prothoracic-gland ventral-gland pericardial-gland neuroendocrine-regulation hormonal-regulation pheromonal-regulation neural-regulation behavioral-regulation social-regulation environmental-regulation developmental-regulation reproductive-regulation metabolic-regulation homeostatic-regulation allostatic-regulation stress-regulation immune-regulation circadian-rhythm circannual-rhythm photoperiodism thermoperiodism biological-clock zeitgeber entrainment free-running-period phase-response-curve masking-effect arousal-threshold sleep torpor diapause quiescence dormancy aestivation hibernation cold-hardiness heat-hardiness desiccation-hardiness anoxia-hardiness starvation-hardiness radiation-hardiness pressure-hardiness gravity-perception magnetic-field-perception electric-field-perception sound-perception vibration-perception substrate-borne-signal air-borne-signal seismic-signal chemical-signal visual-signal tactile-signal auditory-signal multimodal-signal composite-signal redundant-signal amplifying-signal attenuating-signal honest-signal deceptive-signal costly-signal cheap-signal conventional-signal index-signal handicap-signal amplifier social-selection sexual-selection sperm-competition cryptic-female-choice male-male-competition female-female-competition parent-offspring-conflict sibling-conflict worker-queen-conflict worker-worker-conflict sexual-conflict antagonistic-coevolution arms-race evolutionary-dynamics community-dynamics ecosystem-dynamics biogeochemical-cycle carbon-cycle nitrogen-cycle phosphorus-cycle sulfur-cycle water-cycle trophic-transfer production-efficiency consumption-efficiency assimilation-efficiency ecological-efficiency Lindeman-efficiency 10%-rule food-chain food-web trophic-cascade top-down-control bottom-up-control wasps-control donor-control recipient-control interaction-strength interaction-web ecological-network network-topology network-metrics degree-distribution connectance nestedness compartmentalization robustness fragility resilience recovery-time return-time elasticity perturbation pulse-disturbance press-disturbance chronic-disturbance acute-disturbance catastrophic-disturbance natural-disturbance anthropogenic-disturbance habitat-destruction habitat-degradation habitat-modification habitat-loss habitat-isolation edge-effect matrix-effect permeability corridor-effect stepping-stone source-population sink-population metapopulation-dynamics extinction-debt colonization-credit relaxation-effect time-lag historical-legacy priority-effect founder-effect bottleneck-effect selection natural-selection artificial-selection directional-selection stabilizing-selection disruptive-selection balancing-selection frequency-dependent-selection density-dependent-selection r-selection K-selection c-selection s-selection a-selection bet-hedging-selection fluctuating-selection correlational-selection multivariate-selection indirect-selection correlated-response genetic-correlation phenotypic-correlation environmental-correlation correlation-matrix variance-covariance-matrix G-matrix P-matrix E-matrix M-matrix quantitative-genetics heritability narrow-sense-heritability broad-sense-heritability genetic-variance additive-genetic-variance dominance-variance epistatic-variance environmental-variance phenotypic-variance genotype-environment-interaction-variance maternal-variance paternal-variance common-environment-variance special-environment-variance measurement-error-variance response-to-selection realized-heritability predicted-response breeder's-equation selection-gradient selection-differential Lande-equation multivariate-breeder's-equation genetic-constraint evolutionary-constraint developmental-constraint functional-constraint phylogenetic-constraint historical-constraint trade-off allocation-trade-off acquisition-trade-off conversion-trade-off maintenance-trade-off reproduction-survival-trade-off growth-reproduction-trade-off immune-reproduction-trade-off stress-reproduction-trade-off foraging-predation-trade-off competition-colonization-trade-off tolerance-resistance-trade-off plasticity-canalization-trade-off generalist-specialist-trade-off speed-accuracy-trade-off exploration-exploitation-trade-off individual-colony-trade-off within-colony-trade-off between-colony-trade-off life-history-trade-off demographic-trade-off ecological-trade-off evolutionary-trade-off optimization maximization minimization satisficing marginal-value-theorem optimal-foraging-theory optimal-diet-theory central-place-foraging patch-use-theory giving-up-density giving-up-time predation-risk energetic-cost opportunity-cost handling-time search-time travel-time encounter-rate prey-density prey-profitability prey-choice diet-breadth niche-width niche-overlap niche-partitioning resource-selection habitat-selection settlement-choice nest-site-choice host-choice oviposition-choice foraging-choice path-choice route-choice central-place territory core-area edge-area boundary perimeter area volume shape configuration spatial-pattern temporal-pattern diel-pattern seasonal-pattern annual-pattern multiannual-pattern cyclical-pattern irregular-pattern random-pattern clumped-pattern uniform-pattern regular-pattern aggregated-pattern overdispersed-pattern underdispersed-pattern Poisson-distribution negative-binomial-distribution Taylor's-power-law spatial-autocorrelation temporal-autocorrelation cross-correlation spectral-analysis wavelet-analysis time-series-analysis population-time-series community-time-series ecosystem-time-series long-term-study long-term-monitoring long-term-experiment chronosequence space-for-time-substitution paleoecology paleontology fossil-record trace-fossil coprolite nest-fossil amber-inclusion subfossil quaternary holocene pleistocene neogene paleogene cretaceous mesozoic cenozoic geological-time deep-time evolutionary-time ecological-time generational-time physiological-time perception-time reaction-time decision-time memory-time learning-time developmental-time life-span colony-lifespan queen-lifespan worker-lifespan male-lifespan larval-development-time pupal-development-time egg-development-time incubation-time doubling-time half-life relaxation-time resilience-time resistance-time lag-time lead-time forecast-time prediction-time planning-time management-time conservation-time restoration-time mitigation-time adaptation-time speciation-time diversification-time extinction-time persistence-time transience-time ephemerality permanence stability instability equilibrium non-equilibrium steady-state dynamic-state transient-state asymptotic-state attractor repeller limit-cycle chaos stochasticity determinism predictability unpredictability complexity emergence self-organization pattern-formation spatial-self-organization temporal-self-organization spatiotemporal-self-organization swarm-intelligence collective-decision-making consensus-decision quorum-response wisdom-of-crowds information-cascade cultural-evolution gene-culture-coevolution niche-construction extended-phenotype extended-organism superorganism colony-as-individual colony-as-unit-of-selection group-selection multilevel-selection reciprocal-altruism by-product-mutualism amensalism competition predation herbivory parasitism parasitoidism chemical-mimicry tactile-mimicry visual-mimicry acoustic-mimicry defensive-mimicry Vavilovian-mimicry Bakerian-mimicry Gilbertian-mimicry Poultonian-mimicry Browerian-mimicry auto-mimicry intra-specific-mimicry inter-specific-mimicry molecular-mimicry cellular-mimicry tissue-mimicry organ-mimicry behavioral-mimicry reproductive-mimicry social-mimicry nest-mimicry food-mimicry predator-mimicry prey-mimicry host-mimicry guest-mimicry cleptoparasite cuckoo-parasite inquiline guest myrmecophile termitophile aphidophile coccidophile scale-insect-associate mealybug-associate whitefly-associate planthopper-associate treehopper-associate leafhopper-associate cicada-associate butterfly-associate moth-associate beetle-associate fly-associate wasp-associate bee-associate ant-associate spider-associate mite-associate tick-associate nematode-associate flatworm-associate roundworm-associate annelid-associate mollusk-associate crustacean-associate millipede-associate centipede-associate insect-associate vertebrate-associate bird-associate mammal-associate reptile-associate amphibian-associate fish-associate plant-associate fungus-associate bacteria-associate virus-associate archaea-associate protist-associate algae-associate lichen-associate bryophyte-associate pteridophyte-associate gymnosperm-associate angiosperm-associate monocot-associate dicot-associate herb-associate shrub-associate tree-associate vine-associate epiphyte-associate lithophyte-associate rheophyte-associate hydrophyte-associate xerophyte-associate mesophyte-associate hygrophyte-associate sciophyte-associate heliophyte-associate pioneer-plant-associate climax-plant-associate disturbance-plant-associate successional-plant-associate ant-plant-protection-mutualism ant-plant-food-body-mutualism ant-plant-domatia-mutualism ant-plant-extrafloral-nectary-mutualism ant-plant-seed-dispersal-mutualism ant-plant-pollination-mutualism ant-plant-agriculture-mutualism ant-fungus-mutualism ant-bacteria-mutualism ant-virus-mutualism ant-nematode-mutualism ant-mite-mutualism ant-tick-mutualism ant-spider-mutualism ant-wasp-mutualism ant-fly-mutualism ant-beetle-mutualism ant-butterfly-mutualism ant-moth-mutualism ant-bird-mutualism ant-mammal-mutualism ant-reptile-mutualism ant-amphibian-mutualism ant-fish-mutualism ant-human-mutualism ant-domestic-animal-mutualism ant-pest-mutualism ant-crop-mutualism ant-forest-mutualism ant-savanna-mutualism ant-grassland-mutualism ant-desert-mutualism ant-wetland-mutualism ant-riverine-mutualism ant-riparian-mutualism ant-montane-mutualism ant-lowland-mutualism ant-coastal-mutualism ant-island-mutualism ant-continental-mutualism ant-tropical-mutualism ant-temperate-mutualism ant-subtropical-mutualism ant-boreal-mutualism ant-austral-mutualism ant-paleotropical-mutualism ant-neotropical-mutualism ant-afrotropical-mutualism ant-oriental-mutualism ant-palearctic-mutualism ant-nearctic-mutualism ant-holarctic-mutualism ant-pan-tropical-mutualism ant-cosmopolitan-mutualism ant-endemic-mutualism ant-widespread-mutualism ant-restricted-mutualism ant-rare-mutualism ant-common-mutualism ant-abundant-mutualism ant-scarce-mutualism ant-threatened-mutualism ant-invasive-mutualism ant-native-mutualism ant-exotic-mutualism ant-introduced-mutualism ant-naturalized-mutualism ant-feral-mutualism ant-urban-mutualism ant-rural-mutualism ant-agricultural-mutualism ant-natural-mutualism ant-anthropogenic-mutualism ant-pristine-mutualism ant-degraded-mutualism ant-restored-mutualism ant-conserved-mutualism ant-managed-mutualism ant-sustainable-mutualism ant-unsustainable-mutualism ant-resilient-mutualism ant-fragile-mutualism ant-robust-mutualism ant-vulnerable-mutualism ant-resistant-mutualism ant-susceptible-mutualism ant-tolerant-mutualism ant-intolerant-mutualism ant-flexible-mutualism ant-inflexible-mutualism ant-plastic-mutualism ant-canalized-mutualism ant-adaptive-mutualism ant-maladaptive-mutualism ant-optimal-mutualism ant-suboptimal-mutualism ant-efficient-mutualism ant-inefficient-mutualism ant-productive-mutualism ant-unproductive-mutualism ant-successful-mutualism ant-unsuccessful-mutualism ant-stable-mutualism ant-unstable-mutualism ant-persistent-mutualism ant-transient-mutualism ant-obligate-mutualism ant-facultative-mutualism ant-specific-mutualism ant-generalized-mutualism ant-exclusive-mutualism ant-non-exclusive-mutualism ant-symbiotic-mutualism ant-non-symbiotic-mutualism ant-trophic-mutualism ant-defensive-mutualism ant-dispersive-mutualism ant-pollination-mutualism ant-agriculture-mutualism ant-construction-mutualism ant-nutrient-mutualism ant-protection-mutualism ant-cleaning-mutualism ant-transport-mutualism ant-storage-mutualism ant-processing-mutualism ant-consumption-mutualism ant-production-mutualism ant-exchange-mutualism ant-reciprocity-mutualism ant-by-product-mutualism ant-investment-mutualism ant-harvest-mutualism ant-cultivation-mutualism ant-domestication-mutualism ant-selection-mutualism ant-breeding-mutualism ant-engineering-mutualism ant-modification-mutualism ant-creation-mutualism ant-destruction-mutualism ant-transformation-mutualism ant-conversion-mutualism ant-utilization-mutualism ant-exploitation-mutualism ant-cooperation-mutualism ant-competition-mutualism ant-conflict-mutualism ant-resolution-mutualism ant-negotiation-mutualism ant-communication-mutualism ant-signal-mutualism ant-cue-mutualism ant-information-mutualism ant-knowledge-mutualism ant-learning-mutualism ant-memory-mutualism ant-cognition-mutualism ant-intelligence-mutualism ant-decision-mutualism ant-choice-mutualism ant-preference-mutualism ant-motivation-mutualism ant-emotion-mutualism ant-stress-mutualism ant-welfare-mutualism ant-health-mutualism ant-disease-mutualism ant-immunity-mutualism ant-resistance-mutualism ant-tolerance-mutualism ant-recovery-mutualism ant-healing-mutualism ant-therapy-mutualism ant-medicine-mutualism ant-prevention-mutualism ant-security-mutualism ant-safety-mutualism ant-risk-mutualism ant-hazard-mutualism ant-threat-mutualism ant-danger-mutualism ant-damage-mutualism ant-injury-mutualism ant-death-mutualism ant-mortality-mutualism ant-survival-mutualism ant-longevity-mutualism ant-reproduction-mutualism ant-fertility-mutualism ant-fecundity-mutualism ant-sterility-mutualism ant-virginity-mutualism ant-mating-mutualism ant-copulation-mutualism ant-insemination-mutualism ant-fertilization-mutualism ant-egg-mutualism ant-laying-mutualism ant-incubation-mutualism ant-hatching-mutualism ant-emergence-mutualism ant-eclosion-mutualism ant-molting-mutualism ant-ecdysis-mutualism ant-metamorphosis-mutualism ant-development-mutualism ant-growth-mutualism ant-differentiation-mutualism ant-maturation-mutualism ant-aging-mutualism ant-senescence-mutualism ant-decomposition-mutualism ant-recycling-mutualism ant-energy-mutualism ant-carbon-mutualism ant-nitrogen-mutualism ant-phosphorus-mutualism ant-sulfur-mutualism ant-water-mutualism ant-oxygen-mutualism ant-hydrogen-mutualism ant-mineral-mutualism ant-vitamin-mutualism ant-hormone-mutualism ant-enzyme-mutualism ant-protein-mutualism ant-lipid-mutualism ant-carbohydrate-mutualism ant-nucleic-acid-mutualism ant-DNA-mutualism ant-RNA-mutualism ant-gene-mutualism ant-genome-mutualism ant-chromosome-mutualism ant-cell-mutualism ant-tissue-mutualism ant-organ-mutualism ant-system-mutualism ant-organism-mutualism ant-individual-mutualism ant-colony-mutualism ant-population-mutualism ant-species-mutualism ant-genus-mutualism ant-family-mutualism ant-order-mutualism ant-class-mutualism ant-phylum-mutualism ant-kingdom-mutualism ant-domain-mutualism ant-life-mutualism ant-earth-mutualism ant-universe-mutualism
Dendrotettix
Dendrotettix is a genus of spur-throated grasshoppers in the family Acrididae, containing at least three described species distributed in the southeastern United States. Species include the scrub pine grasshopper (D. australis), post oak grasshopper (D. quercus), and Carolina oak grasshopper (D. zimmermanni). Cytogenetic studies have identified chromosome numbers of 2n=23 (male) and 2n=24 (female) with an XO sex determination system, distinguishing this genus from related taxa such as Boonacris and Appalachia.
grasshopper spur-throated Podismini cytogenetics southeastern-US
Enchenopa latipes
wide-footed treehopper
Enchenopa latipes, commonly known as the wide-footed treehopper, is a species of treehopper in the family Membracidae. It is characterized by an enlarged, inflated pronotum typical of the family, which often resembles plant thorns or buds. The species has been documented in field observations on goldenrod stems in the Ozarks and adjacent regions. Males possess a unique XX-X0 sex determination system with a univalent X chromosome that exhibits distinctive segregation behavior during meiosis, segregating intact toward one spindle pole in late anaphase I after autosomes have initiated movement.
treehopper Membracidae thorn-mimicry cytogenetics univalent-X-chromosome Ozarks goldenrod-associate
Heteropeza pygmaea
A minute gall midge (family Cecidomyiidae) described from Europe in 1846. The species has been studied extensively for its unusual cytogenetics and developmental biology, particularly its paedogenetic reproduction and dramatic chromosome elimination during early embryogenesis. Germ-line cells contain approximately 58 chromosomes, but somatic nuclei retain only 10 chromosomes through programmed elimination of E-chromosomes during cleavage.
Cecidomyiidae gall-midge paedogenesis chromosome-elimination developmental-biology model-organism Europe cytogenetics embryology Diptera
Loxa viridis
Loxa viridis is a stink bug species in the family Pentatomidae, characterized by holocentric chromosomes with a diploid number of 2n = 14 (12A + XY). The species exhibits inverted meiosis for sex chromosomes and has been studied cytogenetically from specimens collected in Brazil. Its distribution spans the Caribbean, Middle America, North America, South America, and the Galápagos Islands.
Pentatomidae stink-bug cytogenetics holocentric-chromosomes inverted-meiosis
Marinarozelotes barbatus
A ground-dwelling spider species in the family Gnaphosidae, first described by L. Koch in 1866. The first cytogenetic analysis of this species was conducted on specimens from Turkey, revealing a diploid chromosome number of 2n♂=22 with an X1X20 sex chromosome system. All chromosomes are telocentric, with X1 being the largest and X2 the smallest chromosome in the karyotype. Sex chromosomes exhibit positive heteropycnosis during prophase I of meiosis. The species has a broad native distribution across the Mediterranean to Caucasus region and has been introduced to the USA.
spider arachnid ground-spider cytogenetics introduced-species Mediterranean Caucasus Turkey USA X1X20-sex-chromosomes telocentric-chromosomes
Paratylotropidia brunneri
Brunner's grasshopper
Paratylotropidia brunneri is a species of spur-throated grasshopper in the family Acrididae, first described by Scudder in 1897. The species has been the subject of cytogenetic study due to its unusual chromosome structure, with 19 chromosomes in diploid male cells including four V-shaped multiples. It is found in North America, primarily in the north-central United States.
grasshopper Acrididae Melanoplinae spur-throated cytogenetics North-America Orthoptera
Physocyclus
cellar spiders
Physocyclus is a genus of cellar spiders (family Pholcidae) established by Eugène Louis Simon in 1893. The genus comprises 38 recognized species distributed across multiple continents, with the highest diversity in Mexico. Two distinct species groups are recognized: the globosus group (11 species) and the dugesi group (21 species), distinguished by morphological and biogeographic patterns. The type species, P. globosus, has been widely introduced globally through human activity.
Pholcidae cellar-spiders Mexico introduced-species indoor-spiders phylogenetics cytogenetics web-architecture Araneomorphae Haplogynae
Podismini
spur-throated grasshoppers
Podismini is a tribe of spur-throated grasshoppers within the subfamily Melanoplinae of the family Acrididae. It is distinguished from other Melanoplinae tribes by a cosmopolitan northern hemisphere distribution, with substantial representation outside the Americas. The tribe comprises approximately 12 genera and at least 20 described species, organized into four subtribes (Miramellina, Podismina, Tonkinacridina) and one genus group (Bradynotae). Members are characterized by winglessness or reduced wings in many species, particularly in montane and temperate lineages.
spur-throated wingless montane temperate brachypterous cytogenetics northern-hemisphere
Rhionaeschna
blue-eyed darners, Neotropical Darners
Rhionaeschna is a genus of dragonflies in the family Aeshnidae, commonly known as blue-eyed darners or Neotropical darners. The genus contains approximately 42 species distributed across the Americas from southern Canada to southern Argentina, with the greatest diversity in the Neotropics. Notable exceptions to this range include a complete absence from the Amazon basin. The genus exhibits remarkable cytogenetic diversity, with multiple sex chromosome systems documented across species.
dragonfly darners blue-eyed Neotropical indicator-species cytogenetics
Rhyparochromini
dirt-colored seed bugs
Rhyparochromini is a tribe of dirt-colored seed bugs within the family Rhyparochromidae, representing the most diverse tribe in its family with over 40 genera and 360 described species. Members are characterized cytogenetically by the presence of a pair of microchromosomes (m-chromosomes) and an XY/XX sex chromosome system. The tribe exhibits highest diversity in the Afrotropical, Palearctic, and Oriental biogeographic regions.
Heteroptera Lygaeidae seed-bugs cytogenetics microchromosomes
Spartocera batatas
Giant Sweet Potato Bug, Giant Sweetpotato Bug
Spartocera batatas is a large leaf-footed bug in the family Coreidae, commonly known as the giant sweet potato bug. The species has been subject to detailed cytogenetic study, revealing a complex karyotype with multiple sex chromosomes. It occurs across the Caribbean, Central America, and South America.
leaf-footed-bug Coreidae cytogenetics multiple-sex-chromosomes heteroptera