Monotypic-genus
Guides
Didasys
Didasys is a monotypic genus of tiger moths in the family Erebidae, subfamily Arctiinae. The genus contains a single species, Didasys belae, commonly known as the double-tufted wasp moth. The genus was established by Augustus Radcliffe Grote in 1875. The common name refers to the species' wasp-like appearance, a form of protective mimicry.
Doliotettix
Doliotettix is a monotypic genus of leafhoppers in the family Cicadellidae, established by Ribaut in 1942. The genus contains a single species, Doliotettix lunulata, known from northern Europe. It is classified within the subfamily Deltocephalinae and tribe Athysanini. The genus has been documented in Norway and Sweden based on distribution records.
Dryobius
Dryobius is a monospecific genus of longhorn beetles (family Cerambycidae) containing only Dryobius sexnotatus. The genus name derives from Greek roots meaning "tree-dwelling." The sole species is distributed across the eastern United States, with highest concentration in the Ohio River Valley. Larvae develop in hardwood trees including maple, beech, basswood, and elm.
Dylobolus
Dylobolus is a monotypic genus of longhorn beetles (Cerambycidae) containing the single species Dylobolus rotundicollis. The genus was established by James Thomson in 1868. It belongs to the tribe Hemilophini within the subfamily Lamiinae.
Elliponeura
Elliponeura is a genus of small flies in the family Chloropidae, commonly known as grass flies. The genus was established by Loew in 1869. Only one species, E. debilis, has been formally described. Members of this genus are poorly studied, with limited biological and ecological data available.
Emarginea dulcinea
Emarginea dulcinea is a moth species in the family Noctuidae, described by Harrison Gray Dyar Jr. in 1921. It is recorded from North America and assigned MONA/Hodges number 9719. The genus Emarginea is monotypic, containing only this species.
Emertongone montifer
Lineweaving Spider
Emertongone montifer is a dwarf spider and the sole species in the monotypic genus Emertongone. Originally described as Lophocarenum montiferum in 1882, it was later transferred to Oedothorax before being placed in its current genus in 2022 based on phylogenetic work by Lin, Lopardo & Uhl. It is a member of the sheet-web weaving family Linyphiidae and is known only from the United States.
Endrosis
white-shouldered house moth
Endrosis is a monotypic genus of concealer moths in the family Oecophoridae, subfamily Oecophorinae. The sole included species, Endrosis sarcitrella, is commonly known as the white-shouldered house moth. The genus was established by Hübner in 1825. Several additional species were historically described as members of this genus, but these have since been reclassified, leaving E. sarcitrella as the only confirmed species.
Epantius
Epantius is a genus of darkling beetles in the family Tenebrionidae, established by LeConte in 1851. The genus contains a single described species, Epantius obscurus. Members of this genus are part of the diverse darkling beetle fauna of North America.
Erepsocassis
Erepsocassis is a genus of tortoise beetles established by Spaeth in 1936. It belongs to the family Chrysomelidae, subfamily Cassidinae, and tribe Cassidini. The genus contains a single described species, E. rubella. Members of this group are characterized by their domed, tortoise-like body form typical of the subfamily Cassidinae.
Esperanza texana
Esperanza texana is a broad-headed bug and the sole described species in the genus Esperanza. It belongs to the family Alydidae, a group of true bugs characterized by their expanded, triangular heads. The species has been documented in Texas and surrounding regions, with confirmed host plant associations on Senna species (Leguminosae). Fifth-instar nymphs have been described morphologically, indicating nymphal development occurs directly on host plants.
Esselenia vanduzeei
Vanduzee's Grasshopper
Esselenia vanduzeei is a species of slant-faced grasshopper in the family Acrididae, subfamily Gomphocerinae. It is the sole described species in the genus Esselenia, which is endemic to California. The species was described by Morgan Hebard in 1920 and is named in honor of the entomologist Edward P. Van Duzee. As a member of the Gomphocerinae, it possesses the characteristic slanted face profile typical of this subfamily.
Eubarnesia ritaria
Ocotillo Moth
Eubarnesia ritaria, commonly known as the Ocotillo Moth, is a species of geometrid moth endemic to the American Southwest. It is the sole member of the monotypic genus Eubarnesia. The species was first described by Grossbeck in 1910 and later placed in its current genus by Cockerell in 1917. It is associated with desert habitats where its larval host plant, ocotillo (Fouquieria splendens), occurs.
Euchaetogyne
Euchaetogyne is a genus of tachinid flies established by Townsend in 1908. The genus contains a single described species, Euchaetogyne roederi, originally described by Williston in 1893. These flies are parasitoids, a characteristic feature of the family Tachinidae. The genus is distributed in North America, with records from the United States and Mexico.
Eucrossus
Eucrossus is a monotypic genus of longhorn beetles (Cerambycidae) containing the single species Eucrossus villicornis. The genus was established by LeConte in 1873 and is classified within the subfamily Cerambycinae and tribe Hesperophanini. The sole species represents a rare example of a genus-level taxon with no known congeners.
Eudesma
Eudesma is a genus of cylindrical bark beetles in the family Zopheridae, established by LeConte in 1863. The genus contains a single described species, Eudesma undulata. These beetles belong to a group of primarily wood-associated beetles characterized by their compact, cylindrical body form.
Eulogia ochrifrontella
Broad-banded Eulogia Moth
Eulogia ochrifrontella is a small snout moth and the sole member of its genus. It is commonly known as the broad-banded eulogia moth. The species occurs across much of North America and has been documented from Canada through the eastern and central United States. It is associated with hardwood trees including pecan, oak, and apple.
Eumacrodes yponomeutaria
Eumacrodes yponomeutaria is the sole species in the monotypic genus Eumacrodes, a geometrid moth first described by Achille Guenée in 1858. The species occurs in the Caribbean and North America. As a member of the subfamily Sterrhinae, it belongs to a diverse group of moths commonly known as carpet moths or wave moths. The genus was established by Warren in 1905.
Eumichthus oedipus
Eumichthus oedipus is a longhorn beetle (Cerambycidae) and the sole species in its genus. It was described by John Lawrence LeConte in 1873. The species belongs to the tribe Eumichthini, a small group within the subfamily Cerambycinae. It is known from western North America, with records from British Columbia, Canada, and the western United States.
Eupackardia
Eupackardia is a monotypic moth genus in the family Saturniidae, containing a single species, Eupackardia calleta (the calleta silkmoth). The genus was erected by Theodore Dru Alison Cockerell in 1912. The sole species is notable for its striking black-and-white wing pattern with red thoracic markings, and its caterpillars possess bright aposematic coloration with chemical defenses.
Eupackardia calleta
Calleta Silkmoth, Ocotillo Silkmoth
Eupackardia calleta, the Calleta silkmoth, is a distinctive Saturniidae species and the sole member of its genus. Found in the southwestern United States and Mexico, this moth is strongly associated with ocotillo (Fouquieria splendens), which serves as its primary larval host. Adults are nocturnal and attracted to light. The species is notable for its striking appearance and restricted distribution tied to desert and semi-arid habitats.
Euparthenos
locust underwing
Euparthenos is a monotypic moth genus in the family Erebidae containing a single species, Euparthenos nubilis (locust underwing). The genus was erected by Augustus Radcliffe Grote in 1876. Adults are medium-sized nocturnal moths with distinctive yellow-orange hindwings marked by four concentric black bands. The genus is endemic to North America and closely related to the underwing moths of genus Catocala.
Eupristocerus
Eupristocerus is a monotypic genus of jewel beetles (family Buprestidae) containing the single species Eupristocerus cogitans. The genus is classified within the tribe Coraebini, a group of buprestids characterized by their association with woody host plants. Eupristocerus cogitans is notable as the only coraebine buprestid known from North America north of Mexico.
Euptychodera
Euptychodera is a monotypic genus of shield-backed bugs in the family Scutelleridae, established by Bergroth in 1908. The genus contains a single described species, E. corrugata. Members of Scutelleridae are characterized by an enlarged scutellum that covers most of the abdomen and wings, giving them a distinctive shield-like appearance.
Eurhinosea flavaria
A small geometrid moth found in western North America. The genus Eurhinosea is monotypic, containing only this species. Both the genus and species were described by Packard in 1873. The species name flavaria suggests yellow coloration.
Euryderus grossus
Euryderus grossus is a ground beetle species in the family Carabidae, and the sole member of the genus Euryderus. It occurs in North America, with records from Canada and the United States. As a member of the tribe Harpalini, it belongs to a diverse group of carabid beetles often associated with open habitats. The species was described by Thomas Say in 1830.
Euryscelis suturalis
Euryscelis suturalis is a longhorn beetle (Cerambycidae) and the sole species in its genus. It was originally described by Olivier in 1795 under the name Callidium suturale. The species occurs in the Caribbean and North America. Despite its distinctive taxonomic placement as the only member of Euryscelis, published ecological and behavioral information remains sparse.
Eusomalia
pill beetles
Eusomalia is a genus of pill beetles in the family Byrrhidae. The genus was described by Casey in 1912 and contains a single described species, Eusomalia lecontei. Members of this genus share the characteristic defensive behavior of pill beetles, which curl into a ball when disturbed.
Eustixia
spotted peppergrass moths
Eustixia is a monotypic moth genus in the family Crambidae, containing a single species, Eustixia pupula (spotted peppergrass moth). The genus was established by Jacob Hübner in 1823. Its sole representative is a small moth found in eastern North America, associated with plants in the mustard family.
Eustixia pupula
Spotted Peppergrass Moth
Eustixia pupula, the Spotted Peppergrass Moth, is a small crambid moth and the sole species in its genus. It occurs across eastern North America from Massachusetts to Florida and west to Texas, with records extending north to Ontario. The species is attracted to artificial light and has been documented in residential yards and urban settings.
Euthochtha
helmeted squash bug
Euthochtha is a monotypic genus of leaf-footed bugs in the family Coreidae, containing the single described species E. galeator. The genus is characterized by distinctive morphological features that have earned it the common name "helmeted squash bug." It belongs to the tribe Acanthocerini within the subfamily Coreinae. The genus has been recorded from the Caribbean region and parts of the eastern United States.
Euthyrhynchus
Florida predatory stink bug
Euthyrhynchus is a monotypic genus of predatory stink bugs in the family Pentatomidae, subfamily Asopinae. The sole species, E. floridanus (Florida predatory stink bug), is native to the southeastern United States and has expanded its range northward in recent decades, now regularly occurring as far north as the Mid-Atlantic and New England. This carnivorous shield bug is considered beneficial in agricultural and garden settings due to its predation on pest insects.
Eviridemas minuta
Eviridemas minuta is a small moth species and the sole member of its genus, which was erected by William Barnes and Foster Hendrickson Benjamin in 1929. Originally described by Barnes and James Halliday McDunnough in 1910, this species belongs to the family Noctuidae, commonly known as owlet moths. The genus is monotypic, meaning it contains only this single species.
Evita hyalinaria
Evita hyalinaria is the sole species in the monotypic genus Evita, described by Grossbeck in 1908. It is a geometrid moth found in southwestern North America. The genus was established by Hahn William Capps in 1943. Very few observations exist, with only one documented occurrence in iNaturalist.
Evolenes
Evolenes is a monotypic genus of ground beetles in the family Carabidae, containing the single species Evolenes exarata. The genus was established by LeConte in 1853 and is classified within the subtribe Oodina of the tribe Oodini. The sole species is known from the United States.
Exiliscelis
Exiliscelis is a genus of flies in the family Canthyloscelidae, established by Hutson in 1977. It contains a single described species, Exiliscelis californiensis. Members of this family are small, obscure flies often associated with moist or wetland habitats. The genus is part of the subfamily Synneurinae, a group of primitive nematoceran flies with limited ecological documentation.
Feniseca
North American Harvesters, Harvester
Feniseca is a monotypic genus of butterflies in the family Lycaenidae, containing a single species, Feniseca tarquinius (the harvester). This genus is notable for representing the only obligate carnivorous butterfly in North America. The larvae feed exclusively on aphids rather than plant material, a highly unusual trait among butterflies. Adults are found in wooded habitats near streams, particularly in association with alders.
Feniseca tarquinius
Harvester
Feniseca tarquinius, commonly known as the harvester, is a small and uncommon butterfly native to North America. It is the sole member of the monotypic genus Feniseca, making it taxonomically unique within the family Lycaenidae. The species is notable for its carnivorous larvae, which feed on aphids rather than plant material—a highly unusual trait among butterflies. Adults are typically associated with wooded habitats and forest edges.
Flohria
Flohria is a monotypic genus of rove beetles (Staphylinidae) containing a single species, Flohria subcoerulea. The genus was erected by David Sharp in 1884 and named in honor of collector Julius Flohr. Phylogenetic studies suggest it may occupy a basal position within the subtribe Philonthina, potentially representing a relict lineage.
Floridocassis
Floridocassis is a genus of tortoise beetles (family Chrysomelidae) containing a single described species, F. repudiata. The genus was established by Spaeth in 1952. Tortoise beetles in this subfamily (Cassidinae) are characterized by a shield-like body form and the ability to clamp their elytra tightly against the substrate. The genus name suggests a Florida association, though specific distribution details for the genus remain limited in published sources.
Florinda
Scarlet Sheetweb Weaver, Black-tailed Red Sheetweaver, Red Grass Spider
Florinda is a monotypic genus of dwarf spiders in the family Linyphiidae, containing only Florinda coccinea. This small spider is notable for its bright scarlet coloration with distinctive black markings, including a diagnostic black tubercle on the rear of the abdomen. The genus was established by Octavius Pickard-Cambridge in 1896.
Fossocarus
Fossocarus is a monotypic genus of scarab beetles in the family Scarabaeidae, subfamily Melolonthinae. The genus contains a single described species, F. creoleorum. It belongs to the tribe Melolonthini, commonly known as May beetles or Junebugs. The genus was established by Howden in 1961.
Franclemontia
Franclemontia is a genus of moths in the family Noctuidae, established by Ferguson in 1992. The genus contains a single described species, Franclemontia interrogans (Walker, 1856). It belongs to the subfamily Noctuinae, one of the largest lineages within the owlet moths. Very few observations of this genus exist in natural history databases.
Fumibotys fumalis
Mint Root Borer Moth
Fumibotys fumalis, the Mint Root Borer Moth, is the sole species in its genus. It belongs to the family Crambidae, a group of grass moths. The species is found across most of North America and is associated with mint plants. Its common name derives from the larval habit of boring into mint roots.
Fumontana
Fumontana is a monotypic genus of harvestman (Opiliones: Laniatores) containing the single species F. deprehendor. It is considered an ancient relict lineage with Gondwanan affinities, currently restricted to the southern Appalachian Mountains of the eastern United States. The genus name derives from Latin words for 'smoke' and 'mountain', referencing its discovery in the Great Smoky Mountains.
Fumontana deprehendor
Fumontana deprehendor is the sole species in the monotypic genus Fumontana, a harvestman (order Opiliones) endemic to the southern Appalachian Mountains. Originally described from only four specimens at two old-growth forest localities, expanded field surveys have documented 141 individuals across 22 newly-discovered populations throughout the Appalachian uplands. The species exhibits minimal geographic variation in both body and genital morphology across its disjunct range. Its conservation status has shifted from perceived hyper-rarity to recognition of broader distribution with geographically isolated population units requiring continued study.
Geropa
Geropa is a genus of longhorn beetles (Cerambycidae) established by Casey in 1912. The genus is monotypic, containing only Geropa concolor. It is classified in the subfamily Cerambycinae and tribe Achrysonini.
Gertschanapis shantzi
Gertschanapis shantzi is a minute araneomorph spider and the sole species in its genus. It belongs to the family Anapidae, a group of small spiders often associated with leaf litter and moss habitats. The species was first described from specimens collected in the United States and remains poorly known due to its cryptic size and habitat.
Glauce pectenalaeella
Glauce pectenalaeella is a small moth in the family Gelechiidae. It is the sole species in the genus Glauce. The species is found across eastern and central North America, with records from Canada (Quebec) and multiple U.S. states. The forewings are characterized by dense dark dusting that largely obscures the pale yellowish ground color.
Glaucodontia pyraustoides
Glaucodontia pyraustoides is a species of moth in the family Crambidae, and the sole member of its genus. It was described by Munroe in 1972. The species is known from a small number of records in the southwestern United States. Very little has been published about its biology or ecology.