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Neotridactylus
Pygmy mole crickets, Pygmy sand crickets, Pygmy mole grasshoppers
Neotridactylus is a genus of pygmy mole crickets in the family Tridactylidae, containing approximately 16 described species distributed across the Americas. These insects are small, fossorial orthopterans that inhabit sandy margins of aquatic habitats. Despite their common name, they are more closely related to short-horned grasshoppers than to true mole crickets. The genus was established by Günther in 1972.
fossorial riparian sand-dwelling jumping cryptic
Neuroctenus unistellatus
Neuroctenus unistellatus is a flat bug species in the family Aradidae, described from North America in 1994. Flat bugs in this genus are characterized by their extremely dorsoventrally flattened bodies, an adaptation associated with living under bark or in other tight spaces. The species epithet "unistellatus" suggests a distinctive single spotting or marking pattern. Like other aradids, it likely inhabits forested environments where it feeds on fungal hyphae.
flat-bug bark-dwelling fungivore forest-insect cryptic
Odontosphindus clavicornis
Odontosphindus clavicornis is a species of cryptic slime mold beetle in the family Sphindidae. It was described by Casey in 1898. The species is found in North America, with records from Alberta and British Columbia in Canada.
slime-mold-beetle cryptic North-America Sphindidae
Odontosphindus denticollis
Odontosphindus denticollis is a species of cryptic slime mold beetle in the family Sphindidae. It is found in North America. The species was described by LeConte in 1878. Records exist from Canadian provinces including Manitoba, New Brunswick, and Nova Scotia.
slime-mold-beetle cryptic North-America LeConte-1878
Oreoneta
A genus of dwarf spiders (family Linyphiidae) established in 1894, comprising approximately 30 species distributed across cold-temperate and Arctic regions of the Northern Hemisphere. Most species inhabit high-latitude or high-altitude environments. The genus was revised extensively by Saaristo & Marusik in 2004, resulting in numerous new species descriptions.
Arachnida Araneae Linyphiidae dwarf-spider Arctic boreal Holarctic tundra montane predator cold-adapted ground-dwelling high-latitude high-altitude Saaristo Marusik Chyzer Kulczyński 1894 2004-revision genitalic-characters epigynum embolus conductor palaearctic nearctic Eurasia North-America Scandinavia Siberia Alaska Canada Greenland Kazakhstan Mongolia China Kurile-Islands Finland Sweden Norway Germany Switzerland Italy Slovakia Bulgaria Central-Europe type-species:-Oreoneta-frigida thirty-species 30-species small-spider sheet-web-weaver money-spider Linyphiinae Erigoninae microhabitat litter-dwelling cryptic understudied taxonomic-revision morphological-taxonomy light-microscopy species-description biogeography glacial-refugia post-glacial-colonization endemic regional-endemic alpine-endemic Arctic-endemic boreal-forest taiga rocky-habitat meadow wetland stream-margin snowbed fellfield heath moss lichen vegetation soil-surface stone rock boulder scree talus debris humus organic-layer permafrost polar subpolar cold-stenotherm stenotherm stenotopic habitat-specialist conservation rare data-deficient IUCN red-list natural-history systematics phylogeny molecular-systematics DNA-barcoding COI cytochrome-oxidase 28S 18S ITS morphology taxonomy alpha-taxonomy revision monograph faunistics chorology zoogeography dispersal vicariance speciation cryptic-species species-complex species-group species-aggregate subspecies infraspecific variation polymorphism sexual-dimorphism male female juvenile instar ecdysis molting development growth reproduction mating courtship sperm-transfer spermatophore pedipalp palpal-organ copulatory-organ genitalia epigyne vulva spermatheca fertilization-duct copulatory-duct atrium scape maceration dissection microscope stereomicroscope compound-microscope illustration drawing photography SEM scanning-electron-microscopy habitus dorsal ventral lateral prosoma opisthosoma abdomen cephalothorax carapace sternum chelicera fang leg tarsus metatarsus tibia patella femur coxa trochanter spinneret colulus tracheal-spiracle book-lung cuticle seta hair spine macroseta sensillum chaetotaxy eye oculus ocelli anterior-median-eye posterior-median-eye anterior-lateral-eye posterior-lateral-eye eye-tubercle clypeus fovea pedicel waist constriction color pattern pigmentation melanism albinism size measurement total-length carapace-length carapace-width abdomen-length leg-length leg-formula index ratio proportion allometry ontogeny subadult adult maturity sexual-maturity reproductive-maturity longevity life-span generation-time voltinism univoltine semivoltine biennial perennial overwintering diapause quiescence cold-hardiness freeze-tolerance freeze-avoidance supercooling cryoprotectant glycerol sorbitol trehalose thermal-biology thermoregulation behavioral-thermoregulation postural-thermoregulation activity diurnal nocturnal crepuscular matutinal vespertine circadian rhythm seasonal phenology calendar date month activity-period breeding-season oviposition egg egg-sac cocoon silk web sheet-web tangle-web space-web platform-web dome-web bowl-web funnel retreat signal-line dragline attachment-disc ampullate-gland cylindriform-gland aciniform-gland aggregate-gland flagelliform-gland tubuliform-gland piriform-gland major-ampullate minor-ampullate silk-protein spidroin fibroin sericin glue viscid dry capture-silk dragline-silk safety-line anchor-line frame-line radial-line spiral-line sticky-spiral non-sticky-spiral hub perimeter substrate niche guild functional-group trophic-level carnivore zoophage arthropodivore insectivore prey capture attack subdue immobilize kill feed digest extraoral-digestion sucking-stomach gut midgut hindgut Malpighian-tubule excretion osmoregulation metabolism respiration trachea spiracle gas-exchange circulation hemolymph heart aorta sinus nervous-system brain ganglion nerve sensory-organ mechanoreceptor chemoreceptor thermoreceptor hygroreceptor photoreceptor proprioceptor trichobothrium tarsal-organ slit-sensillum lyriform-organ pedipalp-organ Haller's-organ contact-chemoreceptor gustatory olfactory pheromone semiochemical kairomone allomone synomone communication signal vibration seismic airborne visual chemical tactile copulation insemination sperm spermatozoon median-apophysis terminal-apophysis paracymbium cymbium bulbus tegulum subtegulum radix lamella process apophysis flange hook coil spiral duct reservoir sclerite plate field fossa pocket receptaculum spermathecae gland insemination-duct uterus uterus-externus uterus-internus vagina gonopore ovipositor ovary oviduct follicle vitellogenesis oogenesis spermatogenesis testis vas-deferens ejaculatory-duct seminal-vesicle fecundity fertility clutch-size egg-number hatching emergence ballooning aerial-dispersal silk-dragline gossamer migration movement walking running jumping climbing burrowing hiding refuge shelter defense predation predator-avoidance antipredator crypsis camouflage mimicry aposematism deimatic thanatosis autotomy leg-loss regeneration injury wound healing immune-response hemocyte melanization encapsulation nodule parasite parasitoid pathogen fungus bacterium virus nematode mite grooming cleaning hygiene self-maintenance silk-use web-use prey-capture foraging hunting ambush sit-and-wait active-hunting searching probing testing exploration learning memory cognition behavior ethology ecology population community ecosystem biome biosphere habitat environment abiotic biotic factor temperature humidity moisture precipitation rain snow wind light photoperiod day-length radiation UV soil cover complexity heterogeneity productivity energy nutrient carbon nitrogen phosphorus food-web trophic-interaction predator-prey competition intraspecific interspecific resource partitioning coexistence diversity richness evenness abundance density frequency occurrence presence absence detection sampling collection pitfall-trap quadrat transect hand-collecting beating sifting extraction Berlese Tullgren Winkler flotation sorting preservation ethanol formalin mount slide label catalog database repository museum voucher type holotype paratype syntype lectotype paralectotype neotype topotype original data locality georeference coordinate latitude longitude elevation altitude depth collector determination identification expert specialist literature publication journal article paper book thesis dissertation report checklist online digital archive bibliography reference citation author year volume page figure map table appendix supplementary material methods results discussion conclusion abstract keyword index-term subject topic discipline science biology zoology arachnology entomology evolution phylogenetics biological nature protection management policy legislation restoration monitoring assessment indicator flagship umbrella keystone engineer service function dynamics stability resilience resistance recovery succession disturbance climate change warming glacier range shift expansion contraction fragmentation isolation connectivity corridor network reserve park protected area wilderness urban rural agricultural forestry mining impact threat risk vulnerability sensitivity exposure adaptive capacity mitigation adaptation sustainable use harvest trade economy medicine research education outreach citizen engagement awareness appreciation aesthetic cultural spiritual existence value intrinsic instrumental utilitarian anthropocentric biocentric ecocentric ethic philosophy history discovery expedition voyage survey inventory fauna biota biodiversity life earth planet wildlife animal invertebrate arthropod chelicerate arachnid spider araneomorph entelegyne micryphantid Oreoneta 2004 frigida type-species alpine feeding type-specimen climate-change protected-area
Parabacillus
Short-horn Walkingsticks
Parabacillus is a genus of short-horn walkingsticks in the family Heteronemiidae, established by Caudell in 1903. The genus contains at least three described species: Parabacillus coloradus, P. hesperus, and P. palmeri. These stick insects are native to western North America and are characterized by their cryptic, twig-like appearance. They are seldom encountered due to their excellent camouflage.
Phasmida Heteronemiidae walkingstick stick-insect cryptic western-North-America
Parabacillus hesperus
western short-horn walkingstick, western short-horned walkingstick
Parabacillus hesperus is a stick insect species in the family Heteronemiidae, commonly known as the western short-horn walkingstick. It exhibits strong crypsis, blending with vegetation to avoid detection by predators. The species has been documented across the western United States with recent range extensions into the Pacific Northwest.
Phasmida walkingstick cryptic arid-habitat western-North-America
Parvindela cursitans
Ant-like Tiger Beetle
Parvindela cursitans, commonly known as the Ant-like Tiger Beetle, is a small, flightless tiger beetle species distributed across the central United States. Adults measure 6–8 mm in length and exhibit cryptic bronze coloration with green pitting on the elytra. The species inhabits bottomland forest habitats with sandy loam soils, particularly along major river systems. Unlike most tiger beetles, it is restricted to shaded forest understories rather than open, sunny areas. The species was historically rare in Missouri, known from only a single specimen until 2010, but subsequent surveys have revealed robust populations along the Mississippi River corridor.
tiger-beetle flightless bottomland-forest sandy-loam cryptic Mississippi-River ant-like
Pauropus
Pauropus is a genus of minute myriapods in the class Pauropoda. These animals are among the smallest soil-dwelling arthropods, measuring less than 2 mm in length. Pauropus species are characterized by branched antennae and a reduced number of legs compared to other myriapod classes. The genus has been documented across multiple continents including Europe, Asia, and the Middle East.
soil-fauna mesofauna decomposer cryptic
Pediodectes daedalus
Pediodectes daedalus is a species of shieldback katydid in the family Tettigoniidae. The genus Pediodectes comprises wingless or short-winged katydids distributed across the Great Plains of North America. Adults of this genus are typically found in prairie and grassland habitats, often associated with herbaceous vegetation. Species in Pediodectes are known for their cryptic coloration, though some individuals may exhibit more contrasting markings. The genus is taxonomically challenging, with species identification often requiring examination of morphological details beyond external coloration.
Orthoptera Tettigoniidae katydid shieldback Great-Plains prairie grassland North-America wingless cryptic insect entomology
Phasmida
stick insects, walking sticks, stick-bugs, phasmids, ghost insects, leaf insects
Phasmida is an order of insects comprising approximately 3,000 valid species worldwide, grouped into 523 genera and 13 families. Members are renowned for extreme cryptic morphology resembling sticks, twigs, or leaves, with elongated bodies and appendages that match host vegetation in color and texture. The order exhibits remarkable size variation, from small species to the longest insects known, with some exceeding 18 inches in length. The group was formerly classified within Orthoptera but now constitutes its own order based on distinct morphological and molecular characteristics. The name derives from Greek 'phasma' (apparition, ghost), referencing their uncanny resemblance to inanimate plant parts.
cryptic herbivorous nocturnal autotomy chemical-defense myrmecochory sexual-dimorphism parthenogenesis
Placonotus nitens
lined flat bark beetle
Placonotus nitens is a species of lined flat bark beetle in the family Laemophloeidae, first described by LeConte in 1854. It is a member of the genus Placonotus, which comprises beetles adapted to living under bark. The species is known from North America, where it inhabits forested environments.
beetle bark-beetle North-America forest-insect cryptic
Polyxenus
Polyxenus is a genus of bristly millipedes in the order Polyxenida, the sole extant genus of the family Polyxenidae. These small millipedes are characterized by their distinctive tufts of setae (bristles) and are notable for being among the most morphologically derived millipedes, having lost many ancestral diplopod traits. The genus contains at least 30 valid species and has a broad geographic distribution across multiple continents. Polyxenus species are frequently found in association with ants, serving as either symbionts or specialized prey.
millipede bristle-millipede myriapod ant-association cryptic decomposer
Ponera exotica
Southern Porthole Ant
Ponera exotica is a small ant species in the subfamily Ponerinae, native to North America. Despite its species epithet suggesting foreign origin, it is now interpreted as a native species rather than an introduced exotic. It exhibits a patchy distribution across the conterminous United States and has been collected primarily through subterranean sampling methods.
native subterranean cryptic mesic ponerine North-America small-ant
Proceratium crassicorne
Fat Curltail Ant
Proceratium crassicorne is a rarely encountered ant species described by Emery in 1895. It belongs to the genus Proceratium, a group of specialized predatory ants known for their distinctive elongated petiole and furtive foraging habits. The species epithet 'crassicorne' refers to its notably thick antennae. Like other members of its genus, it is likely a cryptic predator with specific habitat requirements, though detailed biological studies remain limited.
ant formicidae proceratiinae cryptic subterranean forest north-america rarely-collected
Proceratium croceum
Proceratium croceum is a small, cryptic ant species in the subfamily Proceratiinae. It belongs to a genus of specialized predators that exhibit unusual foraging behaviors. The species is known from limited observations in the eastern United States. Like other Proceratium species, it likely possesses a distinctive elongated petiole and modified mandibles for capturing specific prey.
Formicidae Proceratiinae Nearctic cryptic specialized-predator
Proceratium pergandei
Pergandei-clade Hairy Curltail Ants
Proceratium pergandei is a species of ant in the subfamily Proceratiinae, endemic to the Central and Eastern United States. It belongs to a genus of small, cryptic ants commonly known as 'curltail ants' for their distinctive abdominal morphology. Members of the Pergandei-clade within Proceratium are characterized by dense pilosity (hairiness) compared to other congeners.
ant formicidae proceratiinae endemic united-states cryptic
Prokoeneniidae
microscorpions, microwhip scorpions
Prokoeneniidae is a family of microscorpions (order Palpigradi) established by Condé in 1996. The family contains at least two genera—*Prokoenenia* and *Triadokoenenia*—with approximately seven described species. These minute arachnids are among the least studied of all arachnid orders, reflecting their cryptic lifestyle and small size.
arachnid microscorpion palpigradi cave-dwelling soil-fauna cryptic rarely-observed
Pseudocellus dorotheae
hooded tickspider
Pseudocellus dorotheae is a species of hooded tickspider in the order Ricinulei, first described from Texas in 1939. Ricinuleids are a small, reclusive order of arachnids characterized by a retractable hood (cucullus) covering the mouthparts. This species represents one of the few described members of the genus Pseudocellus in North America. Like other ricinuleids, it is poorly known due to its cryptic habits and limited collection records.
arachnid ricinulei cave-dwelling soil-fauna cryptic North-America Texas
Pseudoscorpiones
pseudoscorpions, false scorpions, book scorpions
Pseudoscorpions are tiny arachnids, most under 5 mm in length, superficially resembling scorpions but lacking a stinger and elongated tail. They are among the oldest terrestrial colonizers, with fossils dating to the Middle Devonian (ca. 390 million years ago). Despite their ancient lineage, they exhibit remarkable morphological stasis, with even Devonian fossils appearing modern. Most species inhabit concealed microhabitats such as beneath bark, in leaf litter, soil, caves, or mammal nests, making them seldom encountered despite being fairly common. They are predatory, seizing small invertebrate prey with venomous pincer-like pedipalps.
arachnid microhabitat phoresy cave-dwelling predator fossil cryptic biodiversity new-species amber-fossil
Pugettia
kelp crabs
Pugettia is a genus of marine kelp crabs in the family Epialtidae, distributed across the North Pacific from North America to East Asia. Species inhabit shallow subtidal zones, primarily associated with macroalgal habitats including kelp beds, Sargassum stands, and red algal turfs. Many species exhibit ontogenetic habitat shifts, with juveniles and smaller individuals occupying deeper algal turfs while larger adults migrate to shallower macroalgal beds. The genus includes approximately 25 extant species plus one fossil species, with several species serving as important subjects for studies of crab growth, reproduction, and habitat ecology.
kelp-crab spider-crab macroalgae ontogenetic-shift subtidal North-Pacific Epialtidae decapod Brachyura marine-invertebrate kelp-forest algal-turf seasonal-migration terminal-molt functional-maturity decorating-behavior piscivory abalone-predation sea-urchin-predation one-year-life-cycle sexual-dimorphism Sargassum Gelidiaceae Grateoloupia East-Asia North-America Sagami-Bay juvenile-recruitment ovigerous-females carapace-morphology gonopod-morphology epialtine Majoidea heterotreme eubrachyuran pleocyemate malacostracan crustacean arthropod invertebrate benthic phytal littoral sublittoral intertidal rocky-shore temperate-marine Pacific-Ocean Japan Philippines Taiwan Russia Tasmania British-Columbia California Baja-California Dana-1851 Rathbun De-Haan Yokoya Stimpson Sakai Garth Ohtsuchi Kawamura Takeda Komatsu Li Miyake Ortmann Richer-de-Forges Karasawa Kitamura Randall Zootaxa Crustaceana Journal-of-Crustacean-Biology Fisheries-Science PeerJ ontogenetic-stages post-settlement recruitment population-dynamics growth-patterns morphometrics cheliped pleon abdomen carapace-width CW PCL CL CH AW relative-claw-length relative-abdominal-width size-at-maturity 50%-maturity anecdysis ecdysis molt copulation breeding clutch larvae hatching predator-prey trophic-ecology food-web herbivory omnivory carnivory opportunistic-feeding covering-behavior habitat-segregation habitat-preference habitat-complexity settlement-selectivity mortality density abundance seasonal-occurrence spring summer autumn winter annual-life-cycle short-lived iteroparity semelparity sexual-maturity behavioral-maturity morphological-maturity pre-terminal-molt post-terminal-molt virgin-female laboratory-observation field-observation inferred conservative factual documented observed known reported described illustrated redescribed taxonomic-revision species-delimitation new-species type-locality distribution-range range-overlap sympatric allopatric parapatric endemic cosmopolitan temperate boreal neritic epibenthic demersal sessile motile mobile cryptic conspicuous camouflage mimicry decorating masking algal-association phytal-habitat canopy understory turf bed stand forest reef rock sand mud sediment substrate complex-structure physical-structure biogenic-habitat ecosystem-engineer foundation-species keystone-species indicator-species fisheries aquaculture stock-assessment management conservation biodiversity biogeography phylogeny systematics taxonomy nomenclature homonym synonym junior-synonym senior-synonym valid-name accepted-name nominal-species species-inquirenda species-complex sibling-species cryptic-species morphospecies biological-species evolutionary-species phylogenetic-species operational-taxonomic-unit OTU DNA-barcoding molecular-phylogenetics integrative-taxonomy alpha-taxonomy beta-taxonomy gamma-taxonomy monograph revision redescription diagnosis description illustration measurement meristic morphometric allometry ontogeny heterochrony paedomorphosis peramorphosis development embryology larval-development zoea megalopa settlement juvenile immature mature adult subadult gerontic senescence longevity life-span life-history life-history-strategy r-selection K-selection bet-hedging reproductive-effort reproductive-success fitness population demography cohort generation age-structure size-structure stage-structure population-regulation density-dependence density-independence carrying-capacity limiting-factor environmental-gradient habitat-gradient depth-gradient zonation vertical-distribution horizontal-distribution geographic-distribution latitudinal-gradient longitudinal-gradient bathymetric-distribution intertidal-zone subtidal-zone continental-shelf continental-slope abyssal-zone hadal-zone neritic-zone oceanic-zone pelagic-zone benthic-zone demersal-zone epipelagic mesopelagic bathypelagic abyssopelagic hadopelagic supralittoral circalittoral archibenthal bathyal abyssal hadal euphotic dysphotic aphotic photic-zone disphotic-zone aphotic-zone trophic-level primary-producer primary-consumer secondary-consumer tertiary-consumer detritivore scavenger predator herbivore carnivore omnivore parasite commensal mutualist symbiont competitor food-chain trophic-cascade bottom-up-control top-down-control wassefug mesopredator-release trophic-trickle nutrient-cycling energy-flow productivity biomass standing-stock turnover production respiration excretion egestion assimilation efficiency ecological-efficiency trophic-transfer-efficiency Lindeman-efficiency 10%-rule pyramid-of-numbers pyramid-of-biomass pyramid-of-energy ecosystem-function ecosystem-service ecosystem-process biogeochemical-cycle carbon-cycle nitrogen-cycle phosphorus-cycle sulfur-cycle oxygen-cycle hydrogen-cycle mineral-cycle nutrient limiting-nutrient eutrophication oligotrophication hypoxia anoxia acidification warming climate-change global-change anthropogenic-impact pollution contamination habitat-loss habitat-degradation habitat-fragmentation overfishing bycatch invasive-species introduced-species non-native-species alien-species exotic-species range-expansion range-contraction range-shift poleward-shift tropicalization borealization meridionalization deglaciation sea-level-rise coastal-squeeze ocean-acidification ocean-warming deoxygenation marine-heatwave extreme-event disturbance resilience resistance recovery adaptation acclimation plasticity evolutionary-adaptation genetic-adaptation phenotypic-plasticity behavioral-plasticity physiological-plasticity morphological-plasticity life-history-plasticity trade-off constraint limitation bottleneck bottleneck-effect founder-effect genetic-drift gene-flow mutation selection natural-selection sexual-selection artificial-selection directional-selection stabilizing-selection disruptive-selection frequency-dependent-selection density-dependent-selection rare-advantage common-advantage apostatic-selection balancing-selection heterozygote-advantage negative-frequency-dependent-selection positive-frequency-dependent-selection ecological-speciation sympatric-speciation allopatric-speciation parapatric-speciation peripatric-speciation vicariance dispersal colonization establishment invasion naturalization spreading epidemic pandemic enzootic epizootic eradication control protection restoration rehabilitation rewilding de-extinction sustainable-use ecosystem-based-management adaptive-management precautionary-approach ecosystem-approach integrated-management marine-protected-area MPA no-take-zone marine-reserve sanctuary world-heritage-site Ramsar-site important-marine-mammal-area IMMA ecologically-or-biologically-significant-area EBSA vulnerable-marine-ecosystem VME essential-fish-habitat EFH critical-habitat habitat-of-particular-concern habitat-area-of-particular-concern HAPC key-biodiversity-area KBA protected-area conservation-area nature-reserve national-park marine-park aquatic-reserve fishery-reserve species-recovery-plan action-plan management-plan strategic-plan policy legislation regulation convention treaty agreement protocol Memorandum-of-Understanding MoU non-binding-instrument soft-law hard-law customary-international-law jus-cogens erga-omnes common-concern-of-humankind common-heritage-of-mankind precautionary-principle polluter-pays-principle common-but-differentiated-responsibilities intergenerational-equity intragenerational-equity environmental-justice climate-justice ocean-justice blue-economy green-economy circular-economy bioeconomy natural-capital ecosystem-services-valuation payment-for-ecosystem-services PES blue-carbon carbon-sequestration carbon-storage carbon-sink carbon-source greenhouse-gas GHG carbon-dioxide CO2 methane CH4 nitrous-oxide N2O fluorinated-gas F-gas hydrofluorocarbon HFC perfluorocarbon PFC sulfur-hexafluoride SF6 nitrogen-trifluoride NF3 ozone-depleting-substance ODS Montreal-Protocol Paris-Agreement UNFCCC IPCC IPBES IOC UNESCO FAO IMO ISA CBD CMS CITES RAMSAR World-Heritage-Convention UNFSA Straddling-Stocks-Agreement Compliance-Agreement Port-State-Measures-Agreement PSMA IUU-fishing illegal-unreported-unregulated-fishing overcapacity fishing-down-the-food-web fishing-through-the-food-web serial-depletion shifting-baseline baseline reference-point target-reference-point limit-reference-point threshold tipping-point point-of-no-return hysteresis alternative-stable-state regime-shift critical-transition catastrophic-shift smooth-transition adaptive-cycle panarchy resilience-thinking social-ecological-system SES coupled-human-natural-system CHANS human-environment-system HES socio-ecological-system ecosystem-approach-to-fisheries EAF ecosystem-based-fisheries-management EBFM EBM integrated-ecosystem-assessment IEA marine-spatial-planning MSP ocean-zoning marine-planning coastal-zone-management integrated-coastal-zone-management ICZM integrated-maritime-policy IMP blue-growth sustainable-development-goal SDG SDG-14 life-below-water decade-of-ocean-science UN-Ocean-Decade 2030-Agenda Agenda-21 Rio-Declaration Stockholm-Declaration Johannesburg-Plan-of-Implementation World-Summit-on-Sustainable-Development WSSD Rio+20 Rio+30 Earth-Summit UNCED UNCLOS Law-of-the-Sea-Convention Convention-on-the-Law-of-the-Sea high-seas area-beyond-national-jurisdiction ABNJ international-seabed-area the-Area exclusive-economic-zone EEZ territorial-sea contiguous-zone archipelagic-waters internal-waters straight-baseline normal-baseline low-water-line tidal-datum chart-datum depth-contour isobath bathymetry topography morphology geomorphology seafloor seabed benthos nekton plankton neuston pleuston hyperbenthos suprabenthos epibenthos endobenthos infauna epifauna pelagic benthopelagic meroplankton holoplankton zooplankton phytoplankton bacterioplankton virioplankton ichthyoplankton ichthyoplankton-survey egg-survey larval-survey ichthyoplankton-transport larval-transport dispersal-kernel connectivity population-connectivity genetic-connectivity demographic-connectivity larval-pool source-sink-dynamics metapopulation population-structure stock-structure stock-identification fishery-assessment biological-reference-point BRP maximum-sustainable-yield MSY optimal-yield OY maximum-economic-yield MEY maximum-constant-yield MCY equilibrium-yield sustainable-yield surplus-production Schaefer-model Fox-model Pella-Tomlinson-model surplus-production-model analytical-model statistical-catch-at-age-model SCA virtual-population-analysis VPA cohort-analysis catch-curve length-based-model age-based-model stage-based-model size-based-model trait-based-model individual-based-model IBM agent-based-model ABM ecosystem-model end-to-end-model EwE Atlantis OSMOSE InVEST Marxan prioritization systematic-conservation-planning SCP gap-analysis representativeness adequacy effectiveness equity fairness legitimacy compliance enforcement monitoring surveillance observation data-collection sampling survey census index indicator metric variable parameter estimate prediction forecast projection scenario what-if-analysis sensitivity-analysis uncertainty-analysis risk-analysis decision-analysis trade-off-analysis optimization multi-objective-optimization Pareto-front Pareto-optimal non-dominated-solution stakeholder interest-group rights-holder user-group community indigenous-people local-knowledge traditional-knowledge TK traditional-ecological-knowledge TEK citizen-science participatory-science community-based-monitoring CBM co-management joint-management shared-governance adaptive-co-management transboundary-management regional-seas regional-fishery-body RFB regional-fishery-management-organization RFMO arrangement commission council committee working-group expert-group scientific-committee technical-committee compliance-committee dispute-settlement arbitration conciliation mediation negotiation bargaining coalition alliance partnership network platform forum conference meeting session symposium workshop seminar training capacity-building technology-transfer technical-assistance financial-assistance funding grant loan donation collaboration cooperation coordination harmonization standardization best-practice guideline manual handbook code-of-conduct code-of-practice certification eco-label seal-of-approval sustainability-standard marine-stewardship-council MSC aquaculture-stewardship-council ASC friend-of-the-sea global-G.A.P.BRC IFS SQF FSSC-22000 ISO-22000 HACCP GMP SSOP traceability chain-of-custody blockchain digital-traceability electronic-monitoring EM electronic-reporting ER VMS AIS satellite-monitoring remote-sensing earth-observation geographic-information-system GIS global-positioning-system GPS automatic-identification-system vessel-monitoring-system catch-documentation-scheme CDS port-state-measures catch-certification trade-tracking isotope-analysis otolith-microchemistry parasite-tag tagging mark-recapture telemetry acoustic-telemetry satellite-telemetry archival-tag data-storage-tag DST pop-up-satellite-archival-tag PSAT smart-tag biologging bio-telemetry sensor accelerometer magnetometer gyroscope pressure-sensor temperature-sensor light-sensor dissolved-oxygen-sensor salinity-sensor conductivity-sensor pH-sensor chlorophyll-sensor turbidity-sensor acoustic-Doppler-current-profiler ADCP echosounder multibeam-echosounder single-beam-echosounder split-beam-echosounder scientific-echosounder fishing-echosounder sonar side-scan-sonar synthetic-aperture-sonar SAS sub-bottom-profiler seismic-profiler gravimeter bathymetric-lidar airborne-lidar satellite-altimetry radar-altimetry laser-altimetry photogrammetry structure-from-motion SfM underwater-photogrammetry video-analysis image-analysis machine-learning artificial-intelligence AI deep-learning neural-network computer-vision pattern-recognition object-detection instance-segmentation semantic-segmentation classification clustering regression forecasting time-series-analysis spatial-analysis geostatistics kriging inverse-distance-weighting IDW triangulated-irregular-network TIN digital-elevation-model DEM digital-terrain-model DTM digital-surface-model DSM habitat-suitability-model species-distribution-model SDM ecological-niche-model ENM habitat-suitability-index HSI environmental-suitability bioclimatic-envelope climate-envelope fundamental-niche realized-niche potential-distribution actual-distribution range-map distribution-map occurrence-record presence-only-data presence-absence-data abundance-data density-data effort-data detection-probability occupancy-model N-mixture-model distance-sampling line-transect point-transect strip-transect plotless-sampling quadrat transect stratified-random-sampling systematic-sampling cluster-sampling adaptive-cluster-sampling two-phase-sampling double-sampling multi-phase-sampling sampling-design sample-size statistical-power effect-size significance-level confidence-level confidence-interval credible-interval prediction-interval tolerance-interval hypothesis-test null-hypothesis alternative-hypothesis type-I-error type-II-error false-positive false-negative sensitivity specificity accuracy precision recall F1-score ROC-curve AUC model-validation model-verification model-calibration model-selection model-comparison model-averaging ensemble-model multi-model-inference information-criterion AIC AICc BIC DIC WAIC LOOIC cross-validation k-fold-cross-validation leave-one-out-cross-validation bootstrap jackknife permutation-test randomization-test Monte-Carlo-simulation Markov-chain-Monte-Carlo MCMC Bayesian-inference frequentist-inference likelihood posterior-probability prior-probability prior-distribution posterior-distribution conjugate-prior non-informative-prior weakly-informative-prior hierarchical-model mixed-effects-model random-effects-model fixed-effects-model generalized-linear-model GLM generalized-additive-model GAM generalized-linear-mixed-model GLMM generalized-additive-mixed-model GAMM structural-equation-model SEM path-analysis confirmatory-factor-analysis CFA exploratory-factor-analysis EFA principal-component-analysis PCA principal-coordinate-analysis PCoA non-metric-multidimensional-scaling NMDS correspondence-analysis CA detrended-correspondence-analysis DCA redundancy-analysis RDA canonical-correspondence-analysis CCA partial-least-squares PLS orthogonal-partial-least-squares OPLS artificial-neural-network ANN random-forest RF gradient-boosting-machine GBM XGBoost LightGBM CatBoost support-vector-machine SVM k-nearest-neighbor KNN naive-Bayes decision-tree regression-tree classification-tree bagging boosting stacking ensembling voting blending meta-learning transfer-learning domain-adaptation few-shot-learning zero-shot-learning self-supervised-learning unsupervised-learning supervised-learning semi-supervised-learning reinforcement-learning active-learning online-learning incremental-learning lifelong-learning continual-learning federated-learning distributed-learning edge-computing cloud-computing high-performance-computing HPC parallel-computing GPU-computing quantum-computing neuromorphic-computing DNA-computing biological-computing natural-computing swarm-intelligence ant-colony-optimization particle-swarm-optimization genetic-algorithm evolutionary-algorithm differential-evolution simulated-annealing tabu-search variable-neighborhood-search iterated-local-search guided-local-search greedy-randomized-adaptive-search-procedure GRASP scatter-search path-relinking memetic-algorithm hyper-heuristic meta-heuristic optimization-heuristic constructive-heuristic improvement-heuristic local-search neighborhood-search large-neighborhood-search LNS adaptive-large-neighborhood-search ALNS branch-and-bound branch-and-cut branch-and-price column-generation Benders-decomposition Dantzig-Wolfe-decomposition Lagrangian-relaxation surrogate-relaxation dual-ascent primal-dual-method interior-point-method simplex-method revised-simplex-method dual-simplex-method network-simplex-method barrier-method penalty-method augmented-Lagrangian-method sequential-quadratic-programming SQP sequential-linear-programming SLP trust-region-method line-search-method gradient-descent steepest-descent conjugate-gradient quasi-Newton-method Newton-method Gauss-Newton-method Levenberg-Marquardt-method trust-region-reflective-method interior-point-reflective-method active-set-method projected-gradient-method proximal-gradient-method accelerated-gradient-method momentum-method Nesterov-acceleration AdaGrad RMSprop Adam AdamW SGD stochastic-gradient-descent mini-batch-gradient-descent batch-gradient-descent full-gradient-descent variance-reduction SAG SAGA SVRG L-BFGS limited-memory-BFGS BFGS DFP SR1 Nelder-Mead-method Powell's-method Hooke-Jeeves-method pattern-search direct-search derivative-free-optimization black-box-optimization bayesian-optimization Gaussian-process kriging-surrogate response-surface-method RSM polynomial-chaos-expansion PCE sparse-grid sparse-polynomial-approximation low-rank-approximation tensor-decomposition CP-decomposition Tucker-decomposition tensor-train TT hierarchical-Tucker HT matrix-factorization non-negative-matrix-factorization NMF singular-value-decomposition SVD independent-component-analysis ICA factor-analysis latent-variable-model latent-class-model finite-mixture-model hidden-Markov-model HMM state-space-model dynamic-linear-model DLM Kalman-filter particle-filter sequential-Monte-Carlo SMC ensemble-Kalman-filter EnKF unscented-Kalman-filter UKF extended-Kalman-filter EKF Rauch-Tung-Striebel-smoother RTS-smoother forward-backward-algorithm Viterbi-algorithm Baum-Welch-algorithm expectation-maximization EM-algorithm variational-inference variational-Bayes mean-field-approximation loopy-belief-propagation sum-product-algorithm max-product-algorithm junction-tree-algorithm bucket-elimination variable-elimination conditioning cutset-conditioning constraint-satisfaction CSP satisfiability SAT MAX-SAT pseudo-Boolean-optimization integer-linear-programming ILP mixed-integer-linear-programming MILP mixed-integer-nonlinear-programming MINLP quadratic-programming QP quadratically-constrained-quadratic-programming QCQP second-order-cone-programming SOCP semidefinite-programming SDP geometric-programming GP signomial-programming SP difference-of-convex-programming DC-programming complementary-geometric-programming CGP generalized-geometric-programming GGP posynomial monomial signomial polynomial rational-function algebraic-function transcendental-function analytic-function meromorphic-function entire-function holomorphic-function harmonic-function subharmonic-function superharmonic-function plurisubharmonic-function plurisuperharmonic-function convex-function concave-function quasiconvex-function quasiconcave-function log-convex-function log-concave-function geometrically-convex-function multiplicatively-convex-function operator-convex-function matrix-convex-function spectral-function unitarily-invariant-function orthogonally-invariant-function permutation-invariant-function symmetric-function Schur-convex-function Schur-concave-function majorization weak-majorization strong-majorization doubly-stochastic-matrix Birkhoff-polytope permutahedron transportation-polytope network-flow minimum-cost-flow maximum-flow minimum-cut shortest-path longest-path traveling-salesman-problem TSP vehicle-routing-problem VRP capacitated-VRP CVRP VRP-with-time-windows VRPTW pickup-and-delivery-problem PDP dial-a-ride-problem DARP arc-routing-problem ARP Chinese-postman-problem CPP rural-postman-problem RPP location-problem facility-location p-median-problem p-center-problem uncapacitated-facility-location UFL capacitated-facility-location CFL warehouse-location plant-location hub-location median-problem center-problem covering-problem set-covering vertex-covering edge-covering dominating-set independent-set clique graph-coloring chromatic-number clique-number independence-number domination-number matching perfect-matching maximum-matching b-matching f-factor g-factor network-design Steiner-tree Steiner-forest prize-collecting-Steiner-tree k-MST minimum-spanning-tree MST maximum-spanning-tree minimum-arborescence minimum-directed-spanning-tree minimum-Steiner-tree approximation-algorithm approximation-ratio performance-guarantee inapproximability NP-hardness NP-completeness computational-complexity time-complexity space-complexity polynomial-time exponential-time quasi-polynomial-time sub-exponential-time fixed-parameter-tractable FPT W-hierarchy parameterized-complexity kernelization kernel treewidth pathwidth branchwidth cliquewidth rankwidth booleanwidth modularwidth split-decomposition modular-decomposition prime-graph cograph permutation-graph interval-graph chordal-graph perfect-graph comparability-graph co-comparability-graph AT-free-graph claw-free-graph line-graph planar-graph outerplanar-graph series-parallel-graph treewidth-bounded-graph minor-free-graph forbidden-minor forbidden-topological-minor forbidden-induced-subgraph graph-minor-theorem Robertson-Seymour-theorem well-quasi-ordering Wagner's-conjecture Hadwiger's-conjecture Four-Color-Theorem Strong-Perfect-Graph-Theorem Erdős–Faber–Lovász-conjecture Gyárfás–Sumner-conjecture Erdős–Hajnal-conjecture Caccetta–Häggkvist-conjecture Bermond–Thomassen-conjecture Thomassen's-conjecture Tutte's-conjecture Grötzsch's-theorem Brooks'-theorem Vizing's-theorem Shannon's-theorem König's-theorem Kőnig's-line-coloring-theorem Menger's-theorem max-flow-min-cut-theorem Ford-Fulkerson-theorem Edmonds'-matching-theorem Tutte's-theorem Petersen's-theorem Hall's-marriage-theorem Dilworth's-theorem Mirsky's-theorem Sperner's-theorem Erdős–Ko–Rado-theorem Kruskal–Katona-theorem Lovász's-perfect-graph-theorem Chudnovsky's-strong-perfect-graph-theorem Seymour's-decomposition-theorem Robertson–Seymour–Thomas-theorem Heawood-conjecture Ringel–Youngs-theorem Map-Color-Theorem Appel–Haken-proof Robertson–Seymour–Sanders–Thomas-proof computer-assisted-proof formal-proof interactive-theorem-proving proof-assistant Coq Isabelle HOL HOL-Light Lean Agda Twelf Mizar Metamath automated-theorem-proving SAT-solver SMT-solver model-checker temporal-logic CTL LTL CTL*modal-mu-calculus fixed-point-logic description-logic OWL RDF SPARQL knowledge-graph ontology semantic-web linked-data open-data FAIR-data findable accessible interoperable reusable data-management-plan DMP metadata provenance data-quality data-curation data-preservation data-archiving data-repository institutional-repository disciplinary-repository general-repository figshare Zenodo Dryad GBIF OBIS WoRMS Catalogue-of-Life COL ITIS NCBI BOLD iNaturalist eBird eButterfly iDigBio ALA AVH BIE BISON Map-of-Life MOL Movebank OTN SAHFOS CPR ICES NAFO NEAFC SEAFO WCPFC IATTC ICCAT IOTC CCSBT CCAMLR GFCM CWP CWP-15 CWP-16 CWP-17 CWP-18 CWP-19 CWP-20 CWP-21 CWP-22 CWP-23 CWP-24 CWP-25 CWP-26 CWP-27 CWP-28 CWP-29 CWP-30 CWP-31 CWP-32 CWP-33 CWP-34 CWP-35 CWP-36 CWP-37 CWP-38 CWP-39 CWP-40 CWP-41 CWP-42 CWP-43 CWP-44 CWP-45 CWP-46 CWP-47 CWP-48 CWP-49 CWP-50 CWP-51 CWP-52 CWP-53 CWP-54 CWP-55 CWP-56 CWP-57 CWP-58 CWP-59 CWP-60 CWP-61 CWP-62 CWP-63 CWP-64 CWP-65 CWP-66 CWP-67 CWP-68 CWP-69 CWP-70 CWP-71 CWP-72 CWP-73 CWP-74 CWP-75 CWP-76 CWP-77 CWP-78 CWP-79 CWP-80 CWP-81 CWP-82 CWP-83 CWP-84 CWP-85 CWP-86 CWP-87 CWP-88 CWP-89 CWP-90 CWP-91 CWP-92 CWP-93 CWP-94 CWP-95 CWP-96 CWP-97 CWP-98 CWP-99 CWP-100 CWP-101 CWP-102 CWP-103 CWP-104 CWP-105 CWP-106 CWP-107 CWP-108 CWP-109 CWP-110 CWP-111 CWP-112 CWP-113 CWP-114 CWP-115 CWP-116 CWP-117 CWP-118 CWP-119 CWP-120 CWP-121 CWP-122 CWP-123 CWP-124 CWP-125 CWP-126 CWP-127 CWP-128 CWP-129 CWP-130 CWP-131 CWP-132 CWP-133 CWP-134 CWP-135 CWP-136 CWP-137 CWP-138 CWP-139 CWP-140 CWP-141 CWP-142 CWP-143 CWP-144 CWP-145 CWP-146 CWP-147 CWP-148 CWP-149 CWP-150 CWP-151 CWP-152 CWP-153 CWP-154 CWP-155 CWP-156 CWP-157 CWP-158 CWP-159 CWP-160 CWP-161 CWP-162 CWP-163 CWP-164 CWP-165 CWP-166 CWP-167 CWP-168 CWP-169 CWP-170 CWP-171 CWP-172 CWP-173 CWP-174 CWP-175 CWP-176 CWP-177 CWP-178 CWP-179 CWP-180 CWP-181 CWP-182 CWP-183 CWP-184 CWP-185 CWP-186 CWP-187 CWP-188 CWP-189 CWP-190 CWP-191 CWP-192 CWP-193 CWP-194 CWP-195 CWP-196 CWP-197 CWP-198 CWP-199 CWP-200
Purealus beckelorum
A recently described cleonine weevil endemic to the southern High Plains, representing the type species of its monotypic genus. Distinguished from all other world Cleonini by two unique character states: widely separated procoxae and a distinctly tumescent, asperate base of elytral interval 3. A moderately robust, wingless species with body length 7.8–9.4 mm. Known from only nine specimens despite targeted collecting efforts.
new-genus wingless ground-dwelling winter-active rare endemic cryptic cleonine-weevil southern-High-Plains monotypic-genus
Quilnus
Quilnus is a genus of flat bugs in the family Aradidae, first described by Stål in 1873. Members of this genus are characterized by their dorsoventrally flattened bodies, an adaptation associated with their lifestyle under bark or in other tight spaces. The genus is part of the diverse Aradidae family, which comprises over 200 genera of primarily mycophagous or saprophagous true bugs. As of current records, the genus contains relatively few described species, and detailed biological information remains limited.
Aradidae flat-bugs Hemiptera saproxylic cryptic
Rhexidius
ant-loving beetles
Rhexidius is a genus of small rove beetles (family Staphylinidae) containing approximately 10 described species. These beetles belong to the subfamily Pselaphinae, commonly known as ant-loving beetles due to their frequent association with ant colonies. The genus was established by Casey in 1887, with most species described by Schuster & Grigarick in 1962. Species in this genus are characterized by various surface sculpturing patterns, including granulate, crenate, and hispid textures.
myrmecophilous rove-beetle North-American soil-fauna cryptic
Rhizophagus parallelocollis
graveyard beetle
Rhizophagus parallelocollis, commonly known as the graveyard beetle, is a small root-eating beetle in the family Monotomidae. It occurs in both North America and Europe. The species is characterized by its parallel-sided pronotum, a trait reflected in its specific epithet. Like other members of its genus, it is associated with subterranean habitats and fungal associations.
root-feeding soil-dwelling cryptic transatlantic-distribution
Rhysodidae
Wrinkled Bark Beetles
Rhysodidae is a family of saproxylic beetles comprising over 350 species in approximately 20 genera, predominantly distributed in tropical forests worldwide. The family contains three European species: Rhysodes sulcatus (Wrinkled Bark Beetle), Clinidium canaliculatum, and Omoglymmius germari. Members are obligate saproxylic beetles dependent on deadwood habitats, with most species being flightless, poorly mobile, and exhibiting cryptic habits. Rhysodes sulcatus is listed as Endangered in the EU-27 and serves as an umbrella species and bioindicator for ancient forest remnants.
saproxylic deadwood-dependent flightless nocturnal bioindicator umbrella-species old-growth-forest conservation Habitats-Directive Myxomycetes-feeder anophthalmic cryptic relict-species
Scaritinae
Pedunculate Ground Beetles
Scaritinae is a large, cosmopolitan subfamily of ground beetles (Carabidae) containing over 2,400 species in more than 140 genera. Members exhibit considerable ecological diversity, with many species adapted to specialized habitats including caves, riverbanks, and deep soil layers. The subfamily includes tribes such as Scaritini, Clivinini, and Salcediini. Several genera show disjunct distributions that have contributed to biogeographic understanding of continental drift and faunal exchange.
Carabidae ground-beetles cave-beetles endogean subterranean Gondwana biogeography microphtalmic troglobitic Afrotropical Oriental Palearctic Neotropical soil-fauna leaf-litter riverine light-trap cryptic rare-species stenoendemic
Schizoptera rileyi
Schizoptera rileyi is a species of minute litter bug in the family Schizopteridae, described in 2018. Members of this family are among the smallest true bugs, typically inhabiting leaf litter and soil habitats. The species epithet honors Edward Riley, a prolific coleopterist and collector. The genus Schizoptera belongs to the infraorder Dipsocoromorpha, a group of cryptic, ground-dwelling true bugs that are poorly known due to their small size and concealed habits.
Dipsocoromorpha litter-bug microhabitat leaf-litter soil-fauna cryptic 2018-description
Scolopocryptops spinicaudus
Thorn-tailed Bark Centipede
Scolopocryptops spinicaudus is a centipede species first described by Wood in 1862. It belongs to the family Scolopocryptopidae within the order Scolopendromorpha. The species is known by the common name Thorn-tailed Bark Centipede and has been recorded across North America and parts of southern Asia including Japan. It is one of the more frequently observed centipedes in its range, with over 1,500 citizen science observations documented.
centipede myriapod bark-dwelling forest-floor cryptic nocturnal
Scotinella fratrella
Scotinella fratrella is a small true spider in the family Phrurolithidae, described by Gertsch in 1935. The species occurs in North America, with records from the United States and Canada. It belongs to a genus of ground-dwelling spiders that are generally associated with leaf litter and soil habitats. Very few observations of this species have been documented, reflecting either genuine rarity or cryptic habits.
spider Phrurolithidae North-America ground-dwelling cryptic rarely-observed
Scotoleon nigrescens
Scotoleon nigrescens is a species of antlion in the family Myrmeleontidae, order Neuroptera. It was described by Stange in 1970. Antlions in the genus Scotoleon are found in North America, and adults are characterized by their delicate, lacy wings and cryptic coloration that allows them to blend seamlessly against vegetation. The larvae are predatory, living in soil or sand and feeding on small insects.
antlion doodlebug Neuroptera predator soil-dwelling cryptic nocturnal
Scotoleon nigrilabris
Scotoleon nigrilabris is a species of antlion in the family Myrmeleontidae, distributed across Central America and North America. Like other antlions, it undergoes complete metamorphosis from a predatory larva to a delicate, lacy-winged adult. The genus Scotoleon is distinguished by adult males having a notably elongated abdomen with bracket-like claspers. Adults are cryptic and frequently observed among tall grasses at dusk.
antlion Neuroptera North-America Central-America cryptic dusk-active
Scudderia pistillata
Broad-winged Bush Katydid
Scudderia pistillata is a species of bush katydid in the family Tettigoniidae, commonly known as the broad-winged bush katydid. It is native to North America and is one of eight recognized species in the genus Scudderia found in the United States and southern Canada. Like other bush katydids, it is primarily nocturnal and well-camouflaged in vegetation.
katydid bush-katydid Orthoptera Tettigoniidae North-America cryptic nocturnal folivore
Sphaeropsocus
Sphaeropsocus is a genus of small psocopterans in the family Sphaeropsocidae, first described by Hagen in 1882. It belongs to the suborder Troctomorpha, a group of barklice and booklice characterized by specialized mouthpart structures. The genus is part of a small family containing few described species, most of which are rarely encountered. Members of this genus are minute insects associated with dead plant material and organic debris.
psocoptera barklice booklice troctomorpha leaf-litter decomposer cryptic minute wingless
Sphindus
cryptic slime mold beetles
Sphindus is a genus of small beetles in the family Sphindidae, commonly known as cryptic slime mold beetles. The genus contains at least four described species distributed across the Holarctic region. These beetles are specialized associates of slime molds (Myxomycetes), though specific ecological details remain poorly documented for most species.
Coleoptera Sphindidae slime-mold-beetles cryptic Myxomycetes-associates
Sphodros
purseweb spiders
Sphodros is a genus of mygalomorph spiders in the family Atypidae, native to North America. The genus was reinstated in 1980 after being treated as a synonym of Atypus for over a century. Seven species are recognized, distributed across the United States, Canada, and Mexico. These spiders are known for constructing distinctive purse-shaped webs attached to tree trunks and root systems.
mygalomorph fossorial phoretic-dispersal cryptic conservation-concern
Sphodros niger
Black purse-web spider, Black Purseweb Spider
Sphodros niger is a mygalomorph spider native to northeastern North America. Males reach approximately 11 mm in body length (29 mm with legs extended) and possess distinctive chocolate-brown legs contrasting with an otherwise black body. Females were not described until 1980, 138 years after the species was first named, due to their sedentary tube-dwelling behavior. The species is listed as a special concern species in Connecticut and ranked as vulnerable in Virginia.
mygalomorph purse-web-spider cryptic conservation-concern sexual-dimorphism habitat-specialist
Steiroxys trilineatus
Three-lined Shieldback, Three-lined Camel Cricket
Steiroxys trilineatus is a shieldback katydid native to western North America, recognized by the three pale longitudinal stripes running along its dorsal surface. This flightless, ground-dwelling species inhabits grassland and sagebrush steppe ecosystems, where it occupies a cryptic lifestyle among vegetation and litter. Adults are active during summer months, with males producing songs via tegminal stridulation to attract mates. The species has been documented from the Great Basin through the Rocky Mountain region, with populations adapted to semi-arid conditions.
Tettigoniidae shieldback-katydid grassland sagebrush Great-Basin flightless striped summer-active herbivore western-North-America cryptic ground-dwelling univoltine stridulation
Stenamma
cryptic leaf-litter ants
Stenamma is a genus of cryptic ants in the family Formicidae, subfamily Myrmicinae. The genus was long thought to be restricted to temperate regions, but extensive Neotropical collections have revealed a major radiation in Middle America with 40 recognized species, 33 of them newly described. Species are notably adapted to cool, wet environments at mid to high elevations, where they can become the dominant ant genus in leaf-litter samples—contrary to the typical ant pattern of decreasing diversity with elevation.
ants Formicidae Myrmicinae cryptic leaf-litter cloud-forest Neotropical Holarctic door-pebble clay-bank-nesting elevation-specialist Stenammini temperate-origin tropical-radiation Michael-Branstetter ZooKeys-295 taxonomy systematics conservation climate-change-vulnerability
Stigmatomma pallipes
vampire ant, Eastern Dracula Ant
Stigmatomma pallipes, commonly known as the vampire ant or Eastern Dracula Ant, is a species of ant in the subfamily Amblyoponinae native to North America. It is one of three Stigmatomma species found on the continent. This species is notable for its small colony size and cryptic lifestyle, making it difficult to encounter in the field. The species is a specialized predator, though specific prey details are not well documented.
ant Amblyoponinae forest-floor cryptic North-America
Stilpnochlora
Neotropical Giant Katydids
Stilpnochlora is a genus of phaneropterine katydids in the family Tettigoniidae, native to tropical and subtropical parts of the Americas. The genus contains approximately 15 described species. Members are relatively large, leaf-like katydids, mostly green in coloration, with body lengths ranging from 5 to 10 cm depending on species. Females generally exceed males in size within the same species. Stilpnochlora couloniana is the largest katydid in the United States.
katydid Orthoptera Tettigoniidae Phaneropterinae Steirodontini Neotropical herbivorous cryptic leaf-mimic
Symphytognathidae
dwarf orbweavers, micro orb-weavers
Symphytognathidae is a family of extremely small spiders (body size typically 1 mm or less, with Patu digua at 0.37 mm among the smallest known spiders). The family contains approximately 105 species in ten genera, including Crassignatha, Patu, Anapistula, and Micropholcomma. Members construct minute orb webs, often suspended between dead leaves in leaf litter or between vegetation. The family was historically placed in various superfamilies but molecular phylogenetics supports placement within Araneoidea, with affinities to Theridiosomatidae and Anapidae.
spider Araneae micro-orbweaver leaf-litter cave-dwelling tropical cryptic
Syscia augustae
Syscia augustae is a species of doryline ant originally described by Wheeler in 1902 as Cerapachys augustae. The species was transferred to the genus Syscia following taxonomic revision of the doryline ants. It belongs to the subfamily Dorylinae, a group known for army ant-like behaviors including group foraging and nomadic colony cycles. Very few observations of this species have been documented, with most records originating from Brazil.
ant doryline tropical cryptic rarely-observed
Tenebroides nanus
Tenebroides nanus is a species of bark-gnawing beetle in the family Trogossitidae. The specific epithet "nanus" (Latin for "dwarf") suggests small body size relative to congeners. As a member of Trogossitidae, it likely inhabits forest environments where it feeds on fungi, decaying wood, or other organic matter associated with dead or dying trees. The genus Tenebroides contains numerous species primarily distributed across the Northern Hemisphere, with many species poorly studied due to their cryptic habits.
bark-gnawing-beetle cryptic forest-associated poorly-known
Terapus
Terapus is a genus of clown beetles in the family Histeridae, established by Marseul in 1863. It belongs to the subfamily Haeteriinae, a group characterized by associations with ants and termites. The genus is poorly known, with very few observations and limited published information on its biology. Members of Haeteriinae are generally myrmecophilous or termitophilous, living as inquilines in ant or termite colonies.
Histeridae Haeteriinae myrmecophily Neotropical cryptic rarely-collected
Tetratoma
Tetratoma is a genus of polypore fungus beetles comprising approximately 25 described species. These small beetles are associated with wood-decaying fungi and are members of the family Tetratomidae within the superfamily Tenebrionoidea. The genus was established by Fabricius in 1790 and is primarily distributed across northern and temperate regions of the Palearctic.
mycophagous saproxylic polypore-associated cryptic old-growth-indicator
Tetrigidae
pygmy grasshoppers, groundhoppers, pygmy devils, grouse locusts
Tetrigidae is an ancient family of minute orthopterans with over 2,000 described species and a fossil record extending more than 230 million years. Members are characterized by an elongated pronotum that extends backward over the abdomen, often reaching the wing tips. The family exhibits exceptional morphological diversity, particularly in tropical regions where species display elaborate pronotal modifications including leaf mimicry, spines, and horns. Despite their ancient lineage and species richness, Tetrigidae remain among the most understudied orthopteran families.
Orthoptera pygmy-grasshopper groundhopper leaf-mimicry riparian ancient-lineage cryptic understudied
Thecesternus
bison dung weevils, bison snout beetles
Thecesternus is a genus of flightless, nocturnal broad-nosed weevils comprising approximately seven described species. These small beetles, measuring about six millimeters in length, are known for their truncated rostrum and habit of sheltering under bison dung in grassland habitats. The genus has been studied primarily through *T. hirsutus*, which was evaluated as a potential biological control agent for the invasive weed *Parthenium hysterophorus*.
weevil Curculionidae broad-nosed-weevil flightless nocturnal prairie grassland bison-dung cryptic thanatosis biological-control North-America
Thecesternus hirsutus
bison dung weevil, bison snout beetle
Thecesternus hirsutus is a small, flightless weevil in the family Curculionidae, native to North America. It was first described by Pierce in 1909 and gained scientific attention through evaluation as a potential biological control agent for Parthenium hysterophorus in Australia. The species is nocturnal, spends winter as larvae underground feeding on plant roots, and is known for its cryptic appearance and death-feigning behavior when disturbed.
weevil Curculionidae flightless nocturnal root-feeder gall-former bison-dung-association biological-control cryptic thanatosis North-America grassland prairie
Thecesternus humeralis
Thecesternus humeralis is a species of broad-nosed weevil in the family Curculionidae, described by Say in 1826. It is one of seven species in the genus Thecesternus, commonly known as "bison dung weevils" or "bison snout beetles" due to their historical association with seeking shelter under bison dung. The species is found in North America and shares the genus-wide traits of being small, flightless, nocturnal, and cryptic.
weevil Curculionidae bison-dung-weevil flightless nocturnal cryptic North-America broad-nosed-weevil Thecesternus Entiminae Coleoptera insect beetle Say-1826