Usa
Guides
Pseudanophthalmus nelsoni
Nelson's Cave Beetle
Pseudanophthalmus nelsoni is a small, eyeless ground beetle in the family Carabidae. Described by Barr in 1965, this troglobitic species inhabits cave systems in the United States. Like other members of its genus, it exhibits adaptations to subterranean life including reduced or absent eyes and pale coloration. The species is named in honor of an individual associated with its discovery or study.
Pseudeuophrys erratica
Black-palped Jumping Spider
Pseudeuophrys erratica is a small jumping spider native to Europe and Asia that has been introduced to the eastern and western United States. Unlike its congener P. lanigera, which is abundant in and around buildings, P. erratica is uncommon and prefers natural habitats. Adults are active primarily in spring and summer, with females persisting into autumn.
Psilochorus rockefelleri
A species of cellar spider in the family Pholcidae, described by Gertsch in 1935. The species belongs to a genus characterized by long, delicate legs and small, elongated bodies typical of pholcid spiders. Very little specific information has been published about this particular species beyond its original description and taxonomic placement.
Psinidia amplicornus
Caudell's Long-horned Grasshopper
Psinidia amplicornus, commonly known as Caudell's Long-horned Grasshopper, is a species of band-winged grasshopper in the family Acrididae. It belongs to the tribe Psinidiini within the subfamily Oedipodinae, a group characterized by often having colorful hind wings. The species was described by Caudell in 1903 and is native to the south-central United States.
OrthopteraAcrididaeOedipodinaePsinidiinigrasshopperband-winged-grasshopperNorth-AmericaTexasCaudell-1903PsinidiaamplicornusCaudell's-Long-horned-Grasshopperinsectarthropodhexapodinsectacaeliferaacridideaacridinaepsinidia-amplicornusspeciesacceptedanimaliaarthropodaeukaryotametazoaanimalkatydidcricketorthopterancaudell1903usaunited-statesbandwinged-grasshopperhexapodaPsocus crosbyi
common barklouse
Psocus crosbyi is a species of barklouse described by Chapman in 1930. It belongs to the family Psocidae, a group of small, soft-bodied insects commonly found on bark, foliage, and other surfaces in wooded environments. The species is known from the United States.
Pterostichus empetricola
Pterostichus empetricola is a species of woodland ground beetle in the family Carabidae. It is distributed across the Holarctic region, with records from Europe, Northern Asia (excluding China), and North America including Alaska, Canada, and the United States. The species is part of the diverse genus Pterostichus, which contains numerous ground beetle species.
Pterostichus johnsoni
Johnson's Waterfall Carabid Beetle
Pterostichus johnsoni is a ground beetle in the family Carabidae, described by Ulke in 1889. The species is known from the United States and is associated with waterfall habitats, as indicated by its common name. Very few observations exist in public databases, with only three records documented on iNaturalist. The species belongs to the large genus Pterostichus, which contains numerous similar ground beetles that can be difficult to distinguish without close examination.
Rhadine babcocki
Rhadine babcocki is a species of ground beetle in the family Carabidae. It is part of a genus containing cave-dwelling species found in North America. The genus Rhadine includes several federally listed endangered species that inhabit cave systems in central Texas.
Rhadine perlevis
Rhadine perlevis is a ground beetle in the family Carabidae, described by Casey in 1913. The species is known from Mexico and the southwestern United States. It belongs to a genus containing several cave-dwelling species, though R. perlevis itself is not documented as a cave obligate. The genus Rhadine includes federally endangered species such as R. exilis and R. infernalis, which are restricted to cave systems in central Texas and depend on cave crickets as a food source.
Rhadine umbra
Rhadine umbra is a ground beetle species in the family Carabidae, described by Casey in 1913. It is a member of the genus Rhadine, which contains several troglobitic (cave-dwelling) species, though the specific ecology of R. umbra remains poorly documented. The species is recorded from the United States.
Rhyssomatus
Rhyssomatus is a genus of true weevils (Curculionidae) containing at least 180 described species. The genus includes significant agricultural pests, particularly of soybean and other leguminous crops. Several species have been intensively studied due to their economic impact, including R. nigerrimus (Mexican soybean weevil), R. subtilis (black soybean weevil in Argentina), and R. lineaticollis (milkweed stem weevil in North America). Species exhibit diverse life histories ranging from monophagous specialists to oligophagous generalists on legumes.
Salticus palpalis
Salticus palpalis is a species of jumping spider in the family Salticidae, first described by Banks in 1904. It belongs to a genus known for its excellent vision and active hunting behavior. The species has been recorded in the United States and Mexico.
Sanctanus fusconotatus
Sanctanus fusconotatus is a species of leafhopper in the family Cicadellidae, subfamily Deltocephalinae. It was described by Osborn in 1922. The species belongs to the genus Sanctanus, a group of small, active insects commonly associated with grasses and herbaceous vegetation. Very little specific information is documented about the biology or ecology of this particular species.
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scabriceps
Saprinus scabriceps is a species of clown beetle in the family Histeridae, described by Casey in 1916. Like other members of the genus Saprinus, it is likely associated with carrion and decomposing organic matter. The species has been recorded from the western United States, specifically Nevada and Oregon. As with most histerids, it is presumed to be predatory on other insects, particularly fly larvae, in its habitat.
Saprinus vestitus
Saprinus vestitus is a species of clown beetle in the family Histeridae, described by John Lawrence LeConte in 1851. It is classified within the subfamily Saprininae and placed in the subgenus Xerosaprinus. The species is known from California, USA. Histerid beetles in this genus are typically small, predatory beetles associated with decomposing organic matter.
Scaphinotus petersi grahami
Graham's Snail-eating Beetle
Scaphinotus petersi grahami is a subspecies of ground beetle in the family Carabidae, described by Van Dyke in 1938. It belongs to the tribe Cychrini, commonly known as snail-eating beetles, characterized by specialized mandibular adaptations for feeding on snails. The subspecies is part of the nominate subgenus Scaphinotus (Scaphinotus) within the genus Scaphinotus.
Schizogenius falli
Schizogenius falli is a species of ground beetle in the family Carabidae, described by Whitehead in 1972. It occurs in Central America and North America, with records from Mexico and the United States. As a member of the genus Schizogenius, it belongs to a group of ground beetles whose specific ecological requirements remain poorly documented. The species is represented by limited observation records in biodiversity databases.
Scolopostethus tropicus
dirt-colored seed bug
Scolopostethus tropicus is a species of dirt-colored seed bug in the family Rhyparochromidae, described by Distant in 1882. It belongs to a genus of small, ground-dwelling true bugs commonly found in leaf litter and soil habitats. The species has been documented in Central America and North America, including records from the United States and Guatemala. Like other members of Rhyparochromidae, it is presumed to feed on seeds, though specific dietary studies for this species are lacking.
Scotinotylus pallidus
Scotinotylus pallidus is a species of sheet web spider in the family Linyphiidae. It was first described by James Henry Emerton in 1882. The species is known from Canada and the United States, with records from Alberta, Manitoba, and Ontario in Canada. Like other linyphiids, it constructs horizontal sheet webs to capture prey. The specific epithet 'pallidus' refers to its pale coloration.
Sergiolus angustus
Sergiolus angustus is a ground spider in the family Gnaphosidae, native to western North America. Like other members of its genus, it exhibits bold coloration that may represent mimicry of velvet ants (Mutillidae). The species is medium-sized, diurnal, and nomadic, actively hunting rather than building webs to capture prey. It constructs silk retreats for molting, egg guarding, and overwintering.
Sergiolus decoratus
Sergiolus decoratus is a species of ground spider in the family Gnaphosidae, first described by Kaston in 1945. Like other members of the genus Sergiolus, it is known for its bold, colorful markings that may serve as mimicry of velvet ants (Mutillidae). The species is found in North America, with records from the United States and Canada including Alberta and Manitoba.
Serranillus dunavani
Serranillus dunavani is a species of ground beetle in the family Carabidae, described by Jeannel in 1963. It belongs to the subtribe Anillina, a group of minute carabid beetles characterized by reduced eyes and subterranean habits. The species is known from the United States.
Sisicus penifusifer
dwarf spider
Sisicus penifusifer is a species of dwarf spider in the family Linyphiidae, described by Bishop and Crosby in 1938. It belongs to a genus of small sheet-web weavers. The species has been documented in parts of the United States and Canada, with records from Alberta, British Columbia, and Manitoba.
Speleobama vana
Speleobama vana is a species of rove beetle (Staphylinidae: Pselaphinae) described by Orlando Park in 1951. The genus name Speleobama, combining Greek 'speleo' (cave) and 'bama' (step/walk), indicates an association with cave habitats. The species is known from Alabama, USA, and belongs to the tribe Speleobamini within the diverse Pselaphinae subfamily, which contains many small, cryptic beetles often associated with leaf litter, soil, and subterranean environments.
Sphodros fitchi
Sphodros fitchi is a species of purseweb spider in the family Atypidae. It is known only from the United States. As with other members of the genus, it constructs silk-lined burrows camouflaged with debris, but specific details of its biology remain poorly documented.
Steatoda palomara
Steatoda palomara is a species of cobweb spider in the family Theridiidae. It is known only from the United States, with records from North America. The species was described by Chamberlin & Ivie in 1935. Like other members of the genus Steatoda, it is presumed to construct irregular tangled webs typical of theridiid spiders.
Stenolophus rugicollis
Stenolophus rugicollis is a ground beetle in the family Carabidae, described by LeConte in 1859. The genus Stenolophus comprises small, often abundant beetles commonly known as seedcorn beetles due to their frequent occurrence in agricultural fields. Species in this genus are typically spring-active and readily attracted to lights at night. Stenolophus rugicollis is recorded from the United States.
Stenometopiellus vader
Stenometopiellus vader is a species of leafhopper in the family Cicadellidae, described by Hamilton in 2002. The specific epithet "vader" references the Star Wars character Darth Vader, following a tradition of naming insects after fictional characters. This species belongs to the tribe Cicadulini within the subfamily Deltocephalinae. Records indicate it has been collected in Idaho, USA.
Tachinus axillaris
Tachinus axillaris is a rove beetle (Staphylinidae) described by Erichson in 1839. The species is known from scattered records across the eastern and central United States, with documented occurrences from Alabama to Texas and north to Illinois and New Jersey. As a member of the subfamily Tachyporinae, it belongs to a group of rove beetles often associated with decaying organic matter. The species has been recorded in GBIF with distribution data from 18 states, though detailed biological information remains limited.
Tachinus picipes
Tachinus picipes is a species of rove beetle in the family Staphylinidae, first described by Erichson in 1839. It is distributed across eastern North America, with records from Canada and the United States. As a member of the subfamily Tachyporinae, it belongs to a group of rove beetles often associated with decaying organic matter and fungal habitats. The species epithet 'picipes' refers to the pitch-black (piceous) coloration of the legs.
Tachys austinicus
Tachys austinicus is a small ground beetle in the family Carabidae, first described by Casey in 1918. It belongs to the large genus Tachys, which comprises numerous diminutive carabid beetles often associated with moist habitats. The species was originally described under the genus Paratachys, which is now treated as a subgenus of Tachys. Like other members of this genus, it is likely to be found in leaf litter, soil, and other ground-level microhabitats, though specific ecological details for this species remain poorly documented.
Tachys bradycellinus
Tachys bradycellinus is a species of ground beetle in the family Carabidae, described by Hayward in 1900. The genus Tachys comprises small, fast-running beetles often found in moist microhabitats. Records indicate this species occurs in the United States and North America. Like other members of the genus, it is likely associated with riparian or wetland edges where it preys on small invertebrates.
Tachys columbiensis
Tachys columbiensis is a species of ground beetle in the family Carabidae, described by Hayward in 1900. It belongs to the genus Tachys, a diverse group of small, fast-running beetles commonly known as 'tachys' or 'minute ground beetles.' The genus is characterized by tiny body size and rapid movement. Records indicate presence in the United States and North America.
Tachys mordax
Tachys mordax is a small ground beetle in the family Carabidae, described by John Lawrence LeConte in 1852. The genus Tachys comprises diminutive, fast-running beetles commonly known as 'tiger beetles' or ground beetles, though Tachys species are typically smaller and less conspicuous than the classic tiger beetles of genus Cicindela. Like other members of its genus, T. mordax is likely adapted to open, sandy or disturbed habitats where it actively pursues small invertebrate prey. The species is recorded from the United States and is part of the diverse North American carabid fauna, though specific ecological details remain poorly documented in published literature.
Tachys potomaca
Tachys potomaca is a species of ground beetle in the family Carabidae, described by Erwin in 1981. It belongs to the tribe Bembidiini within the subfamily Trechinae. The species has been recorded in the United States, with distribution data indicating presence in North America. It was originally described under the genus Paratachys, which is now treated as a synonym or subgenus of Tachys. Like other members of the genus, it is likely a small, fast-running beetle associated with ground habitats.
Tachys rhodeanus
Tachys rhodeanus is a species of ground beetle in the family Carabidae. It is found in North America. The species was described by Casey in 1918.
Tachys ventricosus
Tachys ventricosus is a species of ground beetle in the family Carabidae, described by LeConte in 1863. It belongs to the large genus Tachys, which comprises small, often difficult-to-identify beetles commonly known as "tachys" or "tachys beetles." The species is recorded from the United States, with distribution data indicating presence in North America. As with many members of this genus, detailed biological information is limited in available sources.
Taedia fasciola
Taedia fasciola is a species of plant bug in the family Miridae, first described by Knight in 1930. It is recorded from Arizona, USA. As a member of the genus Taedia, it belongs to a group of mirid bugs whose members are generally associated with vegetation, though specific ecological details for this species remain poorly documented.
Talanites exlineae
Talanites exlineae is a ground spider in the family Gnaphosidae, first described by Platnick & Shadab in 1976. The species is known from the United States. As a member of Gnaphosidae, it belongs to a diverse family of nocturnal wandering hunters. Published information on its biology and ecology remains limited.
Tanyptera dorsalis
Antlered Crane Fly
Tanyptera dorsalis is a species of crane fly in the family Tipulidae, commonly known as the Antlered Crane Fly. Males are distinguished by prominent antler-like projections on the head. The species occurs in eastern North America, with records from Canada and the United States.
crane-flyTipulidaeantleredsexual-dimorphismNearcticDipteraNematocerainsectmale-ornamentationTanypteraNorth-AmericaCanadaUnited-StatesMichiganVermontOntarioQuebecMinnesotaIllinoisTennesseeNorth-CarolinaArkansasNewfoundlandTipulomorphaHexapodaPterygotaInsectaArthropodaAnimaliaWalker-1848speciesacceptedexact-matchobservediNaturalistGBIFdistributionbiologyreviewmalehead-projectionsornamentationsexual-selectionidentificationdiagnostic-traitfield-guideentomologynatural-historybiodiversitytaxonomysystematicsphylogenyevolutionecologyhabitatseasonalitylife-cyclereproductionbehaviorecosystem-rolehuman-relevancesimilar-taxamisconceptionsextra-detailstagscompletenesshas-inferred-contentconfidence-notessourceevidencemetadatafull-textabstracttitlejournalsubjectsDOIpaper-summaryGBIF-taxonomy-matchiNaturalist-taxonWikipedia-summaryobservations-countpreferred-common-namekingdomphylumclassorderfamilygenusrankstatusmatch-typedistribution-recordsVermont-USUSUSAMinnOntQueNfldIllArkTennNCAntlered-Crane-Fly1220NoneTanyptera-dorsalisWalker,-1848EXACTMinnesota-to-Ontario,-Quebec-and-Newfoundland,-south-to-Illinois,-Arkansas,-Tennessee-and-North-CarolinahighfalseAbstract-content-was-empty;-metadata-extracted-from-document-structure-only.-Full-text-not-available-in-provided-source.-Distribution-information-limited-to-title-mention-of-Michigan-and-general-'review-of-its-distribution-and-biology.'The-antlered-crane-fly,-Tanyptera-dorsalis-(Walker)-(Diptera:-Tipulidae),-in-Michigan-and-a-Review-of-Its-Distribution-and-BiologyNortheastern-Naturalist10.1656/045.017.0216{"summary":-"The-antlered-crane-fly,-Tanyptera-dorsalis-(Walker)-(Diptera:-Tipulidae),-is-a-species-of-crane-fly-with-distinctive-antler-like-projections-on-the-head-of-males.-The-source-provides-a-review-of-its-distribution-and-biology-in-Michigan-and-broader-range.",-"habitat":-"",-"distribution":-"Michigan;-broader-distribution-reviewed-in-the-paper",-"diet":-"",-"hostAssociations":-[],-"lifeCycle":-"",-"reproduction":-"",-"notableBehaviors":-"",-"ecosystemRole":-"",-"confidenceNotes":-"Abstract-content-was-empty;-metadata-extracted-from-document-structure-only.-Full-text-not-available-in-provided-source.-Distribution-information-limited-to-title-mention-of-Michigan-and-general-'review-of-its-distribution-and-biology.'"}Matched-scientific-name:-Tanyptera-dorsalis-(Walker,-1848)Canada,-USA-(Minn-to-Ont,-Que-and-Nfld,-south-to-Ill,-Ark,-Tenn-and-NC).;-Nearctic;-Canada,-USA-(Minn-to-Ont,-Que-and-Nfld,-south-to-Ill,-Ark,-Tenn-and-NC).;-Nearctic;-Vermont-US,-USTempyra testacea
Tempyra testacea is a species of seed bug in the family Rhyparochromidae, described by Barber in 1948. It belongs to the tribe Udeocorini within the subfamily Rhyparochrominae. The species is known from the United States based on published records. As a member of Rhyparochromidae, it is presumed to be a ground-dwelling seed bug, though specific biological details remain poorly documented in the available literature.
Tenuiphantes zebra
Zebra Thin Sheetweaver
Tenuiphantes zebra is a species of sheetweb spider in the family Linyphiidae, a group known for constructing flat, horizontal webs. First described by Emerton in 1882, this small spider is found in North America, with records from the United States and Canada. As a member of the dwarf spider family Linyphiidae, it contributes to terrestrial arthropod diversity in its range, though detailed ecological studies remain limited.
Terralonus californicus
Intertidal Jumping Spider, Beach Jumping Spider
Terralonus californicus is a jumping spider in the family Salticidae, notable as one of the few spider species known to regularly inhabit coastal beach environments. It is found in the United States, primarily along the Pacific coast. The species has been documented through over 750 observations on iNaturalist, indicating it is relatively well-observed among coastal arachnids. Its intertidal habitat distinguishes it from most other jumping spiders, which typically occupy terrestrial vegetation and ground habitats.
Terralonus mylothrus
Terralonus mylothrus is a species of jumping spider in the family Salticidae, first described by Chamberlin in 1925. It belongs to the genus Terralonus, which comprises small to medium-sized jumping spiders found in North America. The species is known from a limited number of observations and collections, primarily in the United States. As with other salticids, it possesses excellent vision and active hunting behavior.
Thalpius hoegei
Thalpius hoegei is a ground beetle species (Coleoptera: Carabidae) originally described by Bates in 1883. It is currently treated as a synonym of Pseudaptinus hoegei, reflecting taxonomic reclassification within the tribe Zuphiini. The species belongs to a group of carabid beetles characterized by specialized predatory habits and association with ant colonies. Records indicate presence in Mexico and the southwestern United States.
Theridion goodnightorum
Theridion goodnightorum is a species of cobweb spider in the family Theridiidae, described by arachnologist Herbert W. Levi in 1957. The species epithet honors the husband-and-wife arachnologists Clarence and Marie Goodnight. Like other members of the genus Theridion, this species constructs irregular, three-dimensional cobwebs and possesses the characteristic comb-like bristles (setae) on the hind tarsi used to manipulate silk. The species is documented from the southwestern United States and Mexico.
Theridion morulum
Theridion morulum is a species of cobweb spider in the family Theridiidae, first described by O. Pickard-Cambridge in 1898. It belongs to a large genus of small spiders known for their irregular, three-dimensional webs. The species is recorded from the southwestern United States and Mexico, but detailed biological information appears limited in available sources.
Theridion neomexicanum
Theridion neomexicanum is a species of cobweb spider in the family Theridiidae. It is found in the United States and Canada. As a member of the Theridiidae, it constructs irregular, three-dimensional webs typical of the family. The species was described by Banks in 1901.
Tigrosa grandis
Tigrosa grandis is a species of wolf spider in the family Lycosidae, endemic to the United States. The species was originally described by Nathan Banks in 1894. It occurs across a broad central swath of the country, from the northern plains south to Texas. As a member of the wolf spider family, it is an active ground-dwelling hunter that does not build webs to capture prey.
Trechoblemus westcotti
Trechoblemus westcotti is a species of ground beetle in the family Carabidae, described by Barr in 1972. It belongs to the genus Trechoblemus, which is part of the tribe Trechini within the subfamily Trechinae. The species is known from the United States and is named in honor of Richard L. Westcott, an entomologist known for his work on Buprestidae and other beetle groups.