United-states
Guides
Strongylium crenatum
Strongylium crenatum is a darkling beetle (Tenebrionidae: Stenochiinae) first described by Mäklin. The species has been documented across much of the eastern and central United States, with 17 states represented in collection records and a first record from Iowa reported as a notable range extension. The genus Strongylium is currently undergoing taxonomic revision, with some species exhibiting distinctive coloration patterns including bright green or metallic markings on the head and pronotum.
Strumigenys hexamera
Strumigenys hexamera is a species of trap-jaw ant in the genus Strumigenys, first described by Brown in 1958 under the basionym Epitritus hexamerus. The species belongs to the diverse myrmicine ant genus Strumigenys, which comprises over 850 species known for their specialized predatory mandibles. It has been recorded from the conterminous 48 United States.
Suphisellus gibbulus
Suphisellus gibbulus is a species of burrowing water beetle first described by Aubé in 1838. It belongs to the family Noteridae, a group of small aquatic beetles adapted to burrowing in muddy substrates. The species is known from the United States, though specific details about its biology remain poorly documented.
Susuacanga falli
Susuacanga falli is a species of longhorn beetle (family Cerambycidae) described by Linsley in 1940. The species belongs to the tribe Eburiini within the subfamily Cerambycinae. It has been recorded in Mexico and the United States, though specific ecological details remain poorly documented. The genus Susuacanga comprises several species of medium-sized cerambycid beetles primarily distributed in the Americas.
Susuacanga stigmatica
Speckle-necked Longhorn Beetle
Susuacanga stigmatica is a longhorn beetle species in the family Cerambycidae, first described by Chevrolat in 1835. The species belongs to the tribe Eburiini and is known from records in Guatemala, Mexico, and the United States. It is commonly referred to as the Speckle-necked Longhorn Beetle. The genus Susuacanga includes multiple species distributed in the Americas.
Symballophthalmus masoni
Symballophthalmus masoni is a species of hybotid dance fly in the family Hybotidae, described by Chillcott in 1958. It belongs to the subfamily Tachydromiinae and tribe Symballophthalmini. The species is known from the United States. As a member of the Hybotidae, it is likely a predatory fly, though specific ecological details remain undocumented in the available literature.
Synecdoche grisea
Synecdoche grisea is a species of planthopper in the family Achilidae, a group of fulgoroid insects commonly known as achilid planthoppers. The species was described by Van Duzee in 1908 and is known from scattered records across the eastern and midwestern United States. Like other achilids, it is presumed to feed on fungal hyphae rather than plant sap, distinguishing it ecologically from most other planthopper families. The genus Synecdoche is part of the tribe Plectoderini within the subfamily Myconinae.
Synecdoche tricolor
Synecdoche tricolor is a species of planthopper in the family Achilidae, described by O'Brien in 1971. The genus Synecdoche belongs to the tribe Plectoderini within the subfamily Myconinae. Members of the Achilidae are typically found in association with fungi, often in decaying wood or leaf litter habitats. The specific epithet "tricolor" likely refers to a three-colored pattern in the species' coloration.
Tabanus fuscopunctatus
Tabanus fuscopunctatus is a species of horse fly in the family Tabanidae, described by Macquart in 1850. It is recorded from the United States, though specific details regarding its biology, habitat preferences, and ecological role remain poorly documented in available literature. The species belongs to a large genus of biting flies whose members are known for their blood-feeding behavior and roles as pests of livestock and wildlife.
Tabanus gladiator
Tabanus gladiator is a species of horse fly in the family Tabanidae, described by Stone in 1935. It is distributed in the United States. As a member of the genus Tabanus, it shares the general characteristics of large, robust biting flies with prominent compound eyes. The specific epithet "gladiator" suggests a potentially distinctive or formidable appearance among horse flies.
Tabanus molestus
horse fly
Tabanus molestus is a species of horse fly in the family Tabanidae, first described by Thomas Say in 1823. It is distributed in the United States. Like other horse flies, females possess blade-like mouthparts adapted for cutting skin to obtain blood meals, while males have reduced mouthparts and do not blood feed. The species is part of the diverse genus Tabanus, which includes some of the largest biting flies in North America.
Tabanus quinquevittatus
five-striped horse fly
Tabanus quinquevittatus is a species of horse fly in the family Tabanidae. It is distributed in the United States, with records from Vermont and other states. The species has been studied for seasonal variation in body size and relationships among body size, parity, and fecundity in host-seeking females. Like other horse flies, females are blood-feeders while males feed on nectar.
Tabanus sparus
horse fly
Tabanus sparus is a species of horse fly in the family Tabanidae, first described by Whitney in 1879. The species is distributed in the United States and includes two recognized subspecies: T. s. sparus and T. s. milleri. Like other horse flies, adults are likely to be medium to large-sized dipterans with biting mouthparts. The species belongs to the nominate subgenus Tabanus within the genus.
Tabanus trijunctus
Tabanus trijunctus is a species of horse fly in the family Tabanidae. It is distributed in The Bahamas and the United States. Very little specific information is available regarding its biology, ecology, or distinguishing characteristics.
Tabanus turbidus
horse fly
Tabanus turbidus is a species of horse fly in the family Tabanidae, first described by Wiedemann in 1828. It belongs to the large genus Tabanus, which contains many species of biting flies commonly known as horse flies or deer flies. The species has been documented in the United States based on available records.
Tabanus venustus
horse fly
Tabanus venustus is a species of horse fly in the family Tabanidae, first described by Osten Sacken in 1876. It is recorded from the United States. Like other horse flies, females are presumed to be blood-feeders while males feed on nectar. The species is distinguished from congeners by specific morphological features of the genus Tabanus.
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.
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Tapinoma schreiberi is a species of ant in the genus Tapinoma, described by Hamm in 2010. The species is endemic to the United States. It belongs to the subfamily Dolichoderinae, a group known for producing defensive secretions and lacking functional stings. As a recently described species, detailed biological information remains limited.
Telamonanthe rileyi
Telamonanthe rileyi is a treehopper species in the family Membracidae, subfamily Smiliinae, and tribe Telamonini. The species was described by Goding in 1892. It is part of a genus characterized by distinctive pronotal modifications typical of treehoppers. Based on collection records, it occurs in Texas and potentially other parts of the southern and central United States. As with other members of Membracidae, it is presumed to feed on plant sap using piercing-sucking mouthparts, though specific host plants for this species have not been documented in the available sources.
Teminius affinis
prowling spider
Teminius affinis is a species of prowling spider in the family Miturgidae, first described by Banks in 1897. It occurs in the southern United States and Mexico. As a member of the prowling spider family, it is likely an active hunter rather than a web-builder, though specific behavioral observations for this species are limited in the available literature.
Tephritis californica
Tephritis californica is a true fruit fly in the family Tephritidae, described by Doane in 1899. It belongs to the genus Tephritis, a group of small flies known for their patterned wings and association with Asteraceae host plants. The species is recorded from the United States, though specific details about its biology remain limited in published literature.
Tetanocera plebeja
marsh fly
Tetanocera plebeja is a species of marsh fly in the family Sciomyzidae, described by Loew in 1862. Marsh flies in this family are generally associated with wet habitats and are known for their larval predation on aquatic snails. The species has been documented in the northeastern United States, particularly Vermont.
Tetraopes linsleyi
A milkweed longhorn beetle described by Chemsak in 1963. Like other members of the genus Tetraopes, it is a specialist herbivore associated with milkweeds (Asclepias), possessing bright aposematic coloration and the characteristic divided eyes that give the genus its name. The species is known from the United States, though specific details about its range and biology remain limited.
Tetraopes sublaevis
Tetraopes sublaevis is a species of longhorn beetle in the subfamily Lamiinae, described by Thomas Lincoln Casey Jr. in 1913. Like other members of the genus Tetraopes, it is a milkweed specialist. The species is known from the United States, though specific details about its biology and distribution within North America remain poorly documented compared to better-known congeners such as T. tetraophthalmus and T. texanus.
Tetropium abietis
Round-headed Fir Borer
Tetropium abietis is a longhorn beetle species in the family Cerambycidae, described by Fall in 1912. The common name "Round-headed Fir Borer" suggests an association with fir trees (genus Abies). It is a North American species with distribution records from Canada (British Columbia) and the United States. Like other members of the genus Tetropium, it is likely a wood-boring beetle whose larvae develop in coniferous trees.
Theridion cheimatos
Theridion cheimatos is a cobweb spider species in the family Theridiidae. It was described by Gertsch and Archer in 1942. The species is known from the United States, with records from North America. As a member of Theridiidae, it constructs irregular three-dimensional cobwebs and possesses comb-footed spines on the hind legs for manipulating silk.
Theridion dilutum
Theridion dilutum is a species of cobweb spider in the family Theridiidae, described by Herbert W. Levi in 1957. It belongs to one of the largest genera of spiders, with members characterized by their irregular, three-dimensional webs. The species occurs in North America, specifically in the United States and Mexico. Like other theridiids, it possesses comb-like serrated bristles on the hind tarsi used to manipulate silk.
Theridion neshamini
Theridion neshamini is a species of cobweb spider in the family Theridiidae, described by Levi in 1957. The species is known from the United States, though specific details about its biology, habitat preferences, and ecology remain poorly documented. As a member of Theridiidae, it is presumed to construct irregular, three-dimensional cobwebs for prey capture.
Theridion pierre
Theridion pierre is a species of cobweb spider in the family Theridiidae, described by Levi & Patrick in 2013. It is a member of the large genus Theridion, which contains numerous small spiders that construct irregular, three-dimensional webs. The species is known from the United States.
Thesiastes fossulatus
Thesiastes fossulatus is a species of ant-loving beetle in the family Staphylinidae, subfamily Pselaphinae. It is a small rove beetle known from scattered records across the eastern and central United States. Members of this genus are associated with leaf litter and soil habitats. The species was described by Brendel in 1890.
Tideltellus marinus
Tideltellus marinus is a species of leafhopper in the family Cicadellidae, first described as Deltocephalus marinus by Metcalf and Osborn in 1920. It belongs to the subfamily Deltocephalinae, a large and diverse group of leafhoppers commonly associated with grasses and sedges. The species is known from the southeastern United States, with records from Florida, Georgia, and North Carolina. As with most leafhoppers, it is presumed to be a plant-feeding insect, though specific host associations remain undocumented.
Tipula ignobilis
Tipula ignobilis is a species of large crane fly in the family Tipulidae. It is known from Canada and the United States, with records spanning from Manitoba and Ontario south to Kansas, Tennessee, and South Carolina. As a member of the genus Tipula, it belongs to one of the most species-rich genera of crane flies in North America.
Titiotus flavescens
Titiotus flavescens is a species of spider in the family Zoropsidae, commonly known as false wolf spiders or wandering spiders. The species was described by Chamberlin and Ivie in 1941. It is known from the United States, though specific details about its biology and ecology remain poorly documented in available literature.
Torymus californicus
Torymus californicus is a species of chalcid wasp in the family Torymidae, first described by Ashmead in 1886. The species is recorded from the United States. Torymidae are primarily parasitoids associated with gall-forming insects and other hosts. Specific biological details for this species remain poorly documented in available literature.
Townsendiella pulchra
Townsendiella pulchra is a cuckoo bee (family Apidae, subfamily Nomadinae) known from the United States and Mexico. It is a kleptoparasite, meaning females lay eggs in the nests of host bees rather than constructing their own. The species specifically targets Hesperapis larreae as its host. As a member of the tribe Townsendiellini, it belongs to a small group of specialized nomadine bees with limited documented natural history.
Townsendiella rufiventris
Townsendiella rufiventris is a cuckoo bee species in the family Apidae, first described by Linsley in 1942. It belongs to the tribe Townsendiellini within the subfamily Nomadinae. The species has been recorded in the United States and Mexico. As a member of Nomadinae, it is presumed to be a cleptoparasite (cuckoo bee) that lays eggs in the nests of other bees, though specific host relationships remain undocumented.
Trachyphloeosoma advena
broad-nosed weevil
Trachyphloeosoma advena is a species of broad-nosed weevil described by Zimmerman in 1956. It belongs to the tribe Trachyphloeini within the subfamily Entiminae. The species has been documented in the southeastern United States and Hawaii. As with other members of its genus, it is characterized by the broad rostrum typical of Entiminae weevils.
Trichalophus alternatus
Trichalophus alternatus is a species of broad-nosed weevil in the family Curculionidae, first described by Say in 1831. It is a member of the subfamily Entiminae, which comprises the so-called 'true' weevils characterized by their elongated snouts. The species has been documented across western North America from Alaska to Colorado.
Trichiorhyssemus riparius
Trichiorhyssemus riparius is a small aphodiine dung beetle in the family Scarabaeidae, first described by Horn in 1871. It belongs to the tribe Psammodiini, a group commonly associated with sandy habitats. The species is known from the southwestern United States.
Trichocanonura linearis
Trichocanonura linearis is a species of longhorn beetle in the subfamily Lamiinae, and the sole member of its monotypic genus. It was described by Skinner in 1905 based on specimens from Mexico. The species is characterized by its elongated, linear body form typical of many lamiine cerambycids. It is distributed in Mexico and the southern United States.
Trichonephila clavata
Jorō spider, Joro Spider, Parachute spider
Trichonephila clavata, commonly known as the Jorō spider, is a large orb-weaving spider native to East Asia that has become established as an invasive species in the southeastern United States since approximately 2010. First confirmed in Georgia in 2014, it has expanded rapidly across multiple states through a combination of ballooning dispersal and human-mediated transport. The species is notable for its substantial size, striking coloration, and extensive golden webs, but poses minimal risk to humans due to small fangs and docile behavior. Its physiological adaptations—including higher metabolic rate, faster heart rate, and greater cold tolerance than its congener Trichonephila clavipes—suggest potential for continued northward range expansion.
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kathrynae
cuckoo bee
Triepeolus kathrynae is a species of cleptoparasitic cuckoo bee in the family Apidae, tribe Epeolini. The species was described by Rozen in 1989. Like other members of the genus Triepeolus, it is a brood parasite that does not construct nests or gather pollen. It has been recorded from the United States and Mexico.
Triepeolus loomisorum
Triepeolus loomisorum is a cleptoparasitic bee species in the family Apidae, first described by Rozen in 1989. As a member of the genus Triepeolus, it is a cuckoo bee that does not construct nests or gather pollen, instead laying eggs in the nests of host bees. The species is known from the United States and Mexico.
Triepeolus verbesinae
cuckoo bee
Triepeolus verbesinae is a cleptoparasitic bee species in the family Apidae. As a cuckoo bee, females lay eggs in the nests of host bees rather than constructing their own nests or provisioning brood cells. The species is distributed across the United States and Mexico. Like other members of the genus Triepeolus, it is associated with pollen-collecting host bees, though the specific host species for T. verbesinae has not been definitively documented.
Triodoclytus lanifer
Triodoclytus lanifer is a species of longhorn beetle (Cerambycidae) in the tribe Clytini. It was originally described as Clytus lanifer by John Lawrence LeConte in 1873 and later transferred to Triodoclytus. The genus Triodoclytus contains small to medium-sized cerambycine beetles with distinctive antennal and elytral characteristics. Records indicate presence in the United States, though detailed biological information remains limited.
Triopasites penniger
Triopasites penniger is a cuckoo bee species in the family Apidae, subfamily Nomadinae. Like other members of the genus, it is a cleptoparasite that lays eggs in the nests of host bees. The species occurs in the southwestern United States and Mexico. It belongs to the tribe Brachynomadini, a group of small, often inconspicuous cuckoo bees.
Tristyla
Tristyla is a monotypic genus of moths in the family Noctuidae, established by John Bernhardt Smith in 1893. The genus contains a single species, Tristyla alboplagiata, which occurs in the southwestern United States. The genus is classified within the subfamily Noctuinae, one of the largest subfamilies of owlet moths.
Trupanea vicina
Marigold Fruit Fly
Trupanea vicina is a species of tephritid fruit fly in the genus Trupanea, family Tephritidae. It is commonly known as the Marigold Fruit Fly. The species was originally described by Wulp in 1900 under the basionym Urellia vicina. As a member of the Tephritidae family, it belongs to a group of flies commonly referred to as fruit flies or peacock flies, many of which are associated with plants and have economic significance in agriculture.
Tupiocoris similis
Tupiocoris similis is a species of plant bug in the family Miridae, originally described as Dicyphus similis by Kelton in 1980. It belongs to a genus of predatory or phytophagous true bugs distributed across the Nearctic region. The species has been documented in Canada (Ontario) and the United States, with distribution records indicating presence in Nearctic regions including Beringia and California. As a member of the Miridae, it shares the family's characteristic piercing-sucking mouthparts and hemelytral wing structure typical of true bugs.
Tyloderma contusum
hidden snout weevil
Tyloderma contusum is a species of hidden snout weevil in the beetle family Curculionidae. It is found in the United States. As a member of the genus Tyloderma, it belongs to a group of weevils characterized by their concealed rostrum and cryptic habits.