Monotypic
Guides
Tectosternum
Tectosternum is a genus of water scavenger beetles in the family Hydrophilidae, established by Balfour-Browne in 1958. The genus is monotypic, containing only the described species T. naviculare. It belongs to the subfamily Sphaeridiinae, a group commonly known as sphearid beetles or lesser water scavenger beetles, many of which inhabit moist organic substrates rather than strictly aquatic environments. The genus is poorly known, with minimal published biological information.
Tesuquea
Tesuquea is a monotypic genus of moths in the family Carposinidae, established by Klots in 1936. The genus contains a single species, Tesuquea hawleyana, which is restricted to the southern United States. Adults are small moths with a wingspan of approximately 14 mm. The genus is poorly studied, with limited biological and ecological data available.
Tetraleucus
Tetraleucus is a monotypic genus of ground beetles in the family Carabidae, containing only the species Tetraleucus picticornis. The genus was described by Thomas Lincoln Casey Jr. in 1920. It is known from North America, with records from the northeastern United States including Vermont.
Texoreddellia
Texoreddellia is a monotypic genus of nicoletiid silverfish described by Wygodzinsky in 1973. The genus contains a single described species, Texoreddellia texensis. As a member of Nicoletiidae, it belongs to a family of small, eyeless, wingless insects adapted to subterranean or cryptic habitats. The genus is known from limited observations and specimens.
Thalassotrechus
Thalassotrechus is a monotypic genus of ground beetles in the family Carabidae, containing only the species Thalassotrechus barbarae. The genus is notable for its specialized intertidal habitat, with the single species inhabiting crevices in rocky intertidal zones along the Pacific coast of North America. Members of this genus exhibit specialized habitat recognition behaviors mediated by chemical and physical cues in their sediment environment.
Thrinaphe
Thrinaphe is a genus of flat-backed millipedes in the family Xystodesmidae, containing a single described species, T. hargeri. The genus was established by Rowland M. Shelley in 1993 based on specimens from the Cascade Mountains and Willamette Valley region. The name references the three-branched telopodite of the male gonopod and its similarity to the related genus Harpaphe.
Thurberiphaga
Thurberiphaga is a monotypic moth genus in the family Noctuidae, containing a single species, Thurberiphaga diffusa. The genus is endemic to southern Arizona and is tightly associated with its sole host plant, wild cotton (Gossypium thurberi). The caterpillar is a stem-borer with distinctive pinkish coloration and rough setae. Adults are active during the summer monsoon season.
Tlascala
Tlascala is a monotypic genus of snout moths in the family Pyralidae, containing a single species, Tlascala reductella. The genus was described by George Duryea Hulst in 1890. Its sole species has been documented across eastern North America from Ontario south to Florida, with additional records from Honduras.
Tolus
Tolus is a monotypic genus of harvestmen in the family Phalangodidae, described by Goodnight & Goodnight in 1942. The sole described species, Tolus appalachius, is known only from two caves in Tennessee, United States. This genus represents a rare example of cave-adapted opilionid fauna in the Appalachian region.
Toronia
Torus
Toronia is a monotypic genus of evergreen tree in the family Proteaceae, containing the single species Toronia toru, which is endemic to New Zealand. The genus was established in 1975 by Lawrie Johnson and Barbara G. Briggs, separating this species from the related genus Persoonia, though phylogenetic studies now indicate Toronia is nested within Persoonia.
Tracheops
Tracheops is a genus of moths in the family Geometridae, established by George Duryea Hulst in 1896. The genus contains a single described species, Tracheops bolteri. It belongs to the subfamily Ennominae, a diverse group of geometrid moths commonly known as inchworms or loopers due to their larval locomotion.
Trichocosmia
Trichocosmia is a monotypic genus of owlet moths (Noctuidae) established by Grote in 1883. The genus contains a single species, Trichocosmia inornata, which occurs in the southwestern United States. The genus is classified within the subfamily Noctuinae and tribe Hadenini.
Trimitomerus
Trimitomerus is a monotypic genus of beetles in the family Pythidae, commonly known as dead log beetles. The genus contains a single described species, Trimitomerus riversii. Members of this family are associated with decaying wood habitats.
Triocnemis
Triocnemis is a monotypic genus of noctuid moths established by Augustus Radcliffe Grote in 1881. The genus contains a single species, Triocnemis saporis, which occurs in western North America. Little is known of its biology or ecology beyond basic distributional records.
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.
Tropidolophus
great crested grasshopper
Tropidolophus is a monotypic genus of band-winged grasshoppers in the family Acrididae, containing the single species T. formosus. The genus is classified within the subfamily Oedipodinae and tribe Tropidolophini. It is native to North America, with records from the western United States and northeastern Mexico.
Trypanisma
Trypanisma is a genus of small moths in the family Gelechiidae, established by Clemens in 1860. The genus contains a single described species, Trypanisma prudens. Gelechiidae moths are generally small with narrow wings and are commonly known as twirler moths.
Udeopsylla
robust camel cricket
Udeopsylla is a monotypic genus of camel crickets in the family Rhaphidophoridae, containing only the species Udeopsylla robusta. These insects are nocturnal, wingless orthopterans with distinctive defensive behaviors when disturbed, including regurgitation, defecation, and adopting exaggerated postures. The genus was established by Scudder in 1862.
Ulidiotites
Ulidiotites is a genus of picture-winged flies (family Ulidiidae) established by Steyskal in 1961. The genus is monotypic, containing only Ulidiotites dakotana. Ulidiid flies are known for their patterned wings and are often associated with decaying plant matter.
Utabaenetes
Tanner's black camel cricket
Utabaenetes is a monotypic genus of camel crickets (Rhaphidophoridae) endemic to the San Rafael Desert and adjacent Colorado Plateau of the western United States. The sole species, U. tanneri, is restricted to areas of loose sand and active dunes where it reaches high local densities. This dune-dwelling species exhibits specialized behavioral and ecological adaptations to arid environments.
Valonetus
Valonetus is a monotypic genus of dirt-colored seed bugs established by Barber in 1918. It belongs to the family Rhyparochromidae, tribe Myodochini, and contains a single described species, Valonetus puberulus. The genus is part of the large lygaeoid radiation within the Pentatomomorpha. Very few observations of this genus exist in natural history databases.
Viridiseptis
Viridiseptis is a monotypic moth genus in the family Noctuidae, erected in 2015. Its sole species, Viridiseptis marina, was originally described in 1874. The genus is endemic to the Pacific coast of North America, ranging from southwestern Oregon through California. Adults are characterized by distinctive green forewings with complex dark patterning.
Walterella
Walterella is a monotypic moth genus in the family Noctuidae, established by Harrison Gray Dyar Jr. in 1921. The genus contains a single species, Walterella ocellata, which was described by William Barnes and James Halliday McDunnough in 1910. It is known only from the US state of Arizona.
Wespus
Wespus is a genus of armoured harvestmen in the family Phalangodidae, established by Goodnight & Goodnight in 1942. It contains one described species, Wespus arkansasensis, known from Hot Springs, Arkansas. The genus belongs to the suborder Laniatores, a group of harvestmen characterized by robust bodies and raptorial pedipalps. Members are small, with the described species measuring approximately 2.2 mm in body length.
Willisus
Willisus is a monotypic genus of North American araneomorph spiders established by V. D. Roth in 1981. The genus contains a single species, Willisus gertschi, known only from the United States. Its taxonomic placement has been revised, with sources variously placing it in Cybaeidae or Hahniidae. The genus is poorly known, with only two observations documented on iNaturalist.
Xenicopoda
Xenicopoda is a genus of rove beetles (family Staphylinidae) in the tribe Anthophagini. It is monotypic, containing only the single species Xenicopoda helenae, which is known from California. The genus was established by Moore and Legner in 1971.
Xenotemna
Xenotemna is a monotypic genus of tortricid moths established by Powell in 1964. The sole species, Xenotemna pallorana, is a widespread North American tortrix moth with an unusually broad larval host range spanning herbaceous plants, conifers, and woody angiosperms. The genus is classified within the tribe Archipini of subfamily Tortricinae.
Xeromantispa
Xeromantispa is a monotypic genus of mantidflies in the family Mantispidae, established by Hoffman in 2002. The genus contains a single described species, X. scabrosa. Mantidflies are predatory insects characterized by raptorial forelegs resembling those of praying mantises, though they belong to the order Neuroptera rather than Mantodea.
Xylastodoris
royal palm bug
Xylastodoris is a monotypic genus of true bugs in the family Thaumastocoridae, containing the single species Xylastodoris luteolus. The genus is commonly known as the royal palm bug due to its strict association with the royal palm (Roystonea regia). It was described by Barber in 1920 and is placed in the subfamily Xylastodoridinae. The genus represents a highly specialized lineage with an extremely narrow host range.
Xylomeira
horned powder-post beetles
Xylomeira is a genus of horned powder-post beetles in the family Bostrichidae, established by Lesne in 1901. The genus contains a single described species, Xylomeira tridens. Members of this genus belong to the tribe Xyloperthini within the subfamily Bostrichinae. Like other bostrichids, these beetles are wood-boring insects.
Zacotus
Zacotus is a monotypic genus of ground beetles in the family Carabidae, containing the single species Zacotus matthewsii. The genus was established by LeConte in 1869 and is classified within the subfamily Broscinae. The sole species represents a rare example of a genus with no known congeners.
Zoniagrion
exclamation damsel
Zoniagrion is a monotypic genus of damselflies in the family Coenagrionidae, containing a single species, Z. exclamationis. The genus was established by Kennedy in 1917. These are narrow-winged damselflies, placing them within the suborder Zygoptera.