Omaliinae
Guides
Acidota
A genus of rove beetles (Staphylinidae: Omaliinae: Anthophagini) established in 1829. Species occur across the Holarctic region, with documented presence in Eurasia and North America. The genus includes at least 10 described species, with recent taxonomic work clarifying species boundaries and geographic distributions in Russia and China.
Acidota crenata
Crenate Ocellate Rove Beetle
Acidota crenata is a species of rove beetle in the family Staphylinidae, subfamily Omaliinae. The species has a Holarctic distribution, occurring across northern and central Europe, extending eastward through Russia to East Asia, and present in North America including Canada and the United States. It is one of approximately 15 species in the genus Acidota, which are characterized by distinctive ocellate (eye-spotted) patterns on the elytra. The specific epithet 'crenata' refers to the crenate (scalloped or notched) margins characteristic of this species.
Acruliopsis
Acruliopsis is a genus of rove beetles in the family Staphylinidae, subfamily Omaliinae. The genus contains approximately five described species distributed across East Asia and western North America. Species have been recorded from Japan, the Russian Far East, Korea, and the Pacific Northwest of North America. The genus was established by Zerche in 2003.
Acruliopsis tumidula
Acruliopsis tumidula is a small rove beetle (Staphylinidae: Omaliinae) described from the Pacific Northwest of North America. It is one of few species in the genus Acruliopsis, a group of omaliine rove beetles characterized by compact body form and association with forest floor habitats. The species has been recorded from coastal and montane regions of British Columbia, Washington, Oregon, and Alaska.
Amphichroum
Amphichroum is a genus of rove beetles (Staphylinidae) in the subfamily Omaliinae and tribe Anthophagini, established by Kraatz in 1857. The genus comprises approximately 32 described species distributed across montane regions of Asia, with significant diversity in the Himalayan region, Tibet, and southwestern China. Recent taxonomic revisions have added numerous species from China, particularly from Yunnan and Sichuan provinces. Species are primarily known from high-elevation mountain localities.
Amphichroum maculatum
Amphichroum maculatum is a species of rove beetle in the family Staphylinidae, subfamily Omaliinae. It is a small beetle found in western North America, with records from British Columbia south through Washington, Oregon, and California, and east to Nevada. The specific epithet "maculatum" (spotted) suggests a patterned appearance, though detailed morphological descriptions are limited in available sources. As a member of the Omaliinae, it likely inhabits moist terrestrial environments where these beetles are commonly encountered.
Anthobium
Anthobium is a genus of rove beetles (Staphylinidae: Omaliinae: Anthophagini) established by William Elford Leach in 1819. The genus has undergone extensive taxonomic revision, with multiple former genera (Deliphrum, Lathrimaeum, Eudeliphrum, Arpediopsis) synonymized under Anthobium. Species are organized into numerous species groups including atrocephalum, fusculum, gracilipalpe, nigrum, morchella, reflexum, consanguineum, crassum, tectum, algidum, morosum, fortepunctatum, and convexior groups. The genus is distributed across the entire Palaearctic region, with highest diversity in mountainous areas of China, the Himalayas, and Nepal.
Anthophagini
Anthophagini is a tribe of ocellate rove beetles within the subfamily Omaliinae of Staphylinidae. The tribe contains at least 20 genera and 20 described species. Members are characterized by the presence of ocelli, distinguishing them from many other staphylinid groups. The tribe was established by C. G. Thomson in 1859.
Arpedium
Arpedium is a Holarctic genus of rove beetles (Staphylinidae: Omaliinae: Anthophagini) first described by Erichson in 1839. The genus comprises approximately 14 species distributed across the Nearctic and Palaearctic regions, including Europe, Japan, North America, and Central Asia. At least one species, A. cribratum, has been identified as a subnivium specialist—active beneath winter snowpack and rare or inactive during summer. The genus has undergone taxonomic revision, with five new species described recently and several synonymies resolved.
Arpedium schwarzi
Arpedium schwarzi is a rove beetle (Staphylinidae: Omaliinae: Anthophagini) belonging to the Schwarzi species group within the genus Arpedium. It is an eastern North American species with a distribution spanning the eastern United States and southeastern Canada. The species was described by Fauvel in 1878 and has been subject to taxonomic revision, with lectotype designation and redescription in recent studies.
Artochia
Artochia is a genus of rove beetles (Staphylinidae) in the subfamily Omaliinae, tribe Anthophagini. The genus contains two described species: Artochia californica (California) and Artochia productifrons (distributed across British Columbia, Alaska, California, Oregon, Utah, and Washington). It is a small, rarely encountered genus with limited documented observations.
Boreaphilus
Boreaphilus is a genus of rove beetles (Staphylinidae) established by C.R. Sahlberg in 1832. The genus belongs to the subfamily Omaliinae and tribe Coryphiini. Species are distributed across northern regions of Europe, Asia, and North America, with records from Scandinavia, Russia, Japan, and northern North America. The genus includes at least two described species: B. albanicus and B. astur.
Boreaphilus henningianus
Boreaphilus henningianus is a rove beetle (Staphylinidae) with a Holarctic distribution spanning northern Eurasia and North America. The species is associated with cold, northern habitats and has been recorded from boreal and subarctic regions. It belongs to the tribe Coryphiini within the subfamily Omaliinae.
Brathinus
Brathinus is a genus of rove beetles in the family Staphylinidae, distributed across North America and East Asia (Japan, China). The genus is distinguished from typical staphylinids by its unusually long elytra that cover nearly the entire abdomen, rather than leaving most abdominal segments exposed. Six species are currently recognized, with three described from North America and three from Japan. The genus was established by LeConte in 1852.
Brathinus varicornis
Brathinus varicornis is a species of rove beetle in the family Staphylinidae, subfamily Omaliinae. It was described by John Lawrence LeConte in 1852. The species occurs in northeastern North America, with records from Canada and the northeastern United States. Very few observations of this species have been documented, with only two records in iNaturalist as of the data cutoff.
Deinopteroloma
Deinopteroloma is a genus of rove beetles (Staphylinidae: Omaliinae: Anthophagini) established by Jansson in 1946. The genus was transferred from Silphidae to Staphylinidae based on morphological evidence and is now classified within the Anthobium group of genera. Species occur in the Pacific Northwest of North America, the Nepal Himalayas, northeastern Burma, China (Sichuan, Yunnan), and northern Vietnam. The genus includes at least nine described species, with several new species described from China and Vietnam in 2016.
Dropephylla
Dropephylla is a genus of rove beetles (Staphylinidae) established by Mulsant & Rey in 1880. The genus belongs to the subfamily Omaliinae and has been the subject of taxonomic revision for Palaearctic species. Records indicate presence in northern Europe including Denmark, Norway, and Sweden.
Dropephylla cacti
Dropephylla cacti is a rove beetle species in the family Staphylinidae, subfamily Omaliinae, described by Schwarz in 1899. The species epithet 'cacti' suggests an association with cactus habitats. It is recorded from arid and semi-arid regions of the southwestern United States including Arizona, California, Colorado, New Mexico, and Nevada. As a member of the omaliine rove beetles, it likely inhabits decaying plant matter, though specific ecological details remain poorly documented.
Ephelinus
Ephelinus is a genus of rove beetles (Staphylinidae) in the subfamily Omaliinae, described by Cockerell in 1906. The genus belongs to the tribe Coryphiini and is characterized by small body size and association with coastal or intertidal habitats. Species in this genus are poorly documented, with limited ecological and behavioral information available.
Ephelinus guttatus
Ephelinus guttatus is a species of rove beetle (Staphylinidae) in the subfamily Omaliinae. The species was described by John Lawrence LeConte in 1863. It is native to the eastern and southern United States. Like other members of the genus, it likely inhabits leaf litter and decaying organic matter in forested habitats.
Ephelinus notatus
A small rove beetle in the family Staphylinidae, Ephelinus notatus is a rarely encountered species with limited documented ecological information. The genus Ephelinus belongs to the subfamily Omaliinae, a group of rove beetles often associated with decaying organic matter and forest floor habitats. Based on its taxonomic placement and the distribution records from eastern and central United States, this species likely inhabits moist woodland environments where other Omaliinae species are commonly found.
Eucnecosum
Eucnecosum is a genus of rove beetles (Staphylinidae: Omaliinae) established by Reitter in 1909. The genus comprises three valid holarctic species: E. brachypterum, E. tenue, and E. brunnescens, all transferred from the genus Arpedium. These beetles occur in both Europe and North America, with E. tenue having been previously described under multiple synonyms including E. meybohmi.
Eucnecosum brachypterum
Eucnecosum brachypterum is a small rove beetle (Staphylinidae: Omaliinae) with a Holarctic distribution, occurring across boreal and temperate regions of North America and Eurasia. The species was originally described in the genus Arpedium and later transferred to Eucnecosum, a generic placement confirmed by taxonomic revision. It is one of three holarctic Eucnecosum species recognized in North America. The species name refers to its short-winged (brachypterous) condition.
Eucnecosum brunnescens
Eucnecosum brunnescens is a rove beetle in the family Staphylinidae, subfamily Omaliinae. The species was originally described by Sahlberg in 1871 under the genus Arpedium, and later transferred to Eucnecosum. It has a Holarctic distribution, occurring across northern Europe, Russia, and North America from Alaska through Canada to the northern United States.
Eudectus
Eudectus is a genus of rove beetles in the family Staphylinidae, subfamily Omaliinae. The genus was established by Redtenbacher in 1857 and contains at least two described species. Members are found in disjunct regions of Europe and Japan, suggesting a relictual distribution pattern.
Eusphalerini
Eusphalerini is a tribe of rove beetles within the subfamily Omaliinae, established by Hatch in 1957. The tribe contains small to medium-sized beetles characterized by particular configurations of the abdominal tergites and wing venation. Members are primarily found in the Northern Hemisphere, with greatest diversity in the Palearctic and Nearctic regions. The group remains relatively poorly studied compared to other omaliine tribes.
Eusphalerum carolinensis
Eusphalerum carolinensis is a species of rove beetle in the family Staphylinidae, described by Zanetti in 2014. It belongs to the subfamily Omaliinae and tribe Eusphalerini. The species is known from multiple states in the eastern and central United States.
Eusphalerum convexum
Eusphalerum convexum is a small rove beetle in the family Staphylinidae, subfamily Omaliinae. The species is known from eastern North America, with records spanning Canada and the northeastern and midwestern United States. Like other members of the genus, it is associated with decaying organic matter and fungal habitats.
Eusphalerum orientale
Eusphalerum orientale is a rove beetle in the subfamily Omaliinae, distributed across northeastern North America with scattered records extending to the Pacific Northwest. The species is documented from Canada and the United States, though specific ecological and behavioral details remain poorly studied. It belongs to a genus commonly associated with decaying organic matter and fungal habitats.
Eusphalerum pothos
Eusphalerum pothos is a species of rove beetle (Staphylinidae) in the subfamily Omaliinae. It is broadly distributed across northern North America, with records spanning Canada from British Columbia to the Atlantic provinces, and the northern United States from Alaska to the Northeast. The species is one of approximately 50 North American members of the genus Eusphalerum, a group of small omaliine rove beetles often associated with decaying plant matter and fungal habitats.
Eusphalerum rugulosum
Eusphalerum rugulosum is a small rove beetle in the subfamily Omaliinae, first described from North America in 1853. Members of this genus are generally associated with decaying plant matter and fungal habitats. The species has been documented across western and northern North America, with scattered records extending to the northeastern United States. It remains poorly studied, with limited published information on its biology.
Eusphalerum swauki
Eusphalerum swauki is a species of rove beetle in the family Staphylinidae, described by Hatch in 1957. It belongs to the subfamily Omaliinae, a group of small to medium-sized beetles often associated with decaying plant matter and fungal habitats. The species has a restricted distribution in western North America, with records from the Pacific Northwest and adjacent regions of Canada and the United States.
Geodromicus
Geodromicus is a genus of rove beetles (Coleoptera: Staphylinidae: Omaliinae: Anthophagini) established by Redtenbacher in 1857. The genus is distributed across the Palaearctic region, with species occurring from Western Europe through Central Asia to East Asia. Taxonomic research has organized species into multiple species groups including the bodemeyeri, convexicollis, brevicollis, plagiatus, major, lestevoides, crassipalpis, aokii, and sinuatus groups. The genus has been subject to extensive revision, with numerous synonymies established and several new species described in recent years.
Geodromicus brunneus
Geodromicus brunneus is a species of rove beetle in the family Staphylinidae, subfamily Omaliinae. It is native to eastern North America, with documented records from Canada and the United States. The species was originally described by Thomas Say in 1823. Like other members of the genus Geodromicus, it is a ground-dwelling beetle typically found in forest floor habitats.
Geodromicus plagiatus
Geodromicus plagiatus is a rove beetle (Staphylinidae: Omaliinae) first described by Fabricius in 1798. It belongs to the plagiatus species group, one of several species groups within the genus defined by male genitalia morphology. The species has a broad Palaearctic distribution and has been recently recorded from previously unreported regions including Albania, Cataluña (Spain), Moldova, Georgia, Uzbekistan, and extensive areas of Russia.
Geodromicus strictus
Geodromicus strictus is a rove beetle in the family Staphylinidae, subfamily Omaliinae. The species was described by Fauvel in 1889 and occurs in northeastern North America. It is a member of the tribe Anthophagini, a group associated with riparian and moist forest habitats. Published records are sparse, with only two observations documented on iNaturalist as of the data cutoff.
Haida
Haida is a genus of rove beetles (family Staphylinidae) described by Keen in 1897. It belongs to the subfamily Omaliinae and tribe Coryphiini. The genus is rarely encountered, with limited observational records.
Hapalaraea
Hapalaraea is a genus of rove beetles in the family Staphylinidae, subfamily Omaliinae. The genus was established by C.G. Thomson in 1858 and contains at least two described species: Hapalaraea alutacea and Hapalaraea hamata. These beetles are distributed across Europe and North America. As members of the Omaliinae, they are associated with forest floor habitats and decomposing organic matter.
Hapalaraea hamata
Hapalaraea hamata is a species of rove beetle in the family Staphylinidae, subfamily Omaliinae. The species was described by Fauvel in 1878. It belongs to the tribe Omaliini, a group of rove beetles typically associated with decaying organic matter and fungal habitats. The genus Hapalaraea is characterized by specific morphological features of the mouthparts and antennae.
Hapalaraea megarthroides
Hapalaraea megarthroides is a rove beetle in the subfamily Omaliinae, first described from the Pacific Northwest region. The species belongs to a genus characterized by compact body form and association with forest floor habitats. Records indicate it occurs in western North America from British Columbia to California.
Holoboreaphilus
Holoboreaphilus is a genus of rove beetles (Staphylinidae: Omaliinae) established by Campbell in 1978. The genus includes at least one species, Holoboreaphilus nordenskioeldi, which has been documented from both northeastern and northwestern North America with fossil occurrences in Late Pleistocene deposits. The genus belongs to the tribe Coryphiini within the subfamily Omaliinae.
Holoboreaphilus nordenskioldi
Holoboreaphilus nordenskioldi is a species of rove beetle in the family Staphylinidae, subfamily Omaliinae. It has a Holarctic distribution spanning northern regions of North America and Eurasia. The species was described by Mäklin in 1878 and is placed in the tribe Coryphiini. Like other members of this genus, it is associated with northern boreal and arctic-alpine habitats.
Microedus
Microedus is a genus of small rove beetles in the family Staphylinidae, subfamily Omaliinae, tribe Anthophagini. The genus was historically known only from North America but was expanded to the Palaearctic Region following taxonomic revision in 2022, which synonymized two Palaearctic genera (Altaiodromicus and Liophilydrodes) with Microedus. The genus currently contains 16 species: seven in the Nearctic Region and nine in the Palaearctic Region. Members of this genus belong to the Hygrogeus group of omaliine rove beetles.
Microedus austinianus
Nearctic rove beetle and type species of the genus Microedus. First illustration of mouthparts and aedeagus provided in 2022 taxonomic revision. One of seven Nearctic species in a genus now recognized as transcontinental.
Microedus fenderi
Microedus fenderi is a species of rove beetle in the family Staphylinidae, subfamily Omaliinae. It was described by Hatch in 1957 and is known from limited collection records in the Pacific Northwest region of North America. Like other members of the Omaliinae, it is a small beetle associated with forest floor habitats. Very little is known about its biology or ecology due to its rarity and the difficulty of sampling small staphylinid beetles.
Olophrum
Olophrum is a genus of rove beetles (Staphylinidae: Omaliinae) distributed across Eurasia and North America. The genus contains at least seven recognized North American species, including four Holarctic species (O. latum, O. boreale, O. consimile, O. rotundicolle), one eastern North American endemic (O. obtectum), and two western North American species (O. cascadense, O. idahoense). Species-level taxonomy has been revised with lectotype designations and synonymies established.
Olophrum consimile
Olophrum consimile is a Holarctic rove beetle (Staphylinidae: Omaliinae) found across northern North America and Eurasia. First described by Gyllenhal in 1810, this species has accumulated multiple junior synonyms due to morphological variability. The species is part of a genus of small, ground-dwelling beetles associated with moist forest habitats.
Olophrum latum
Olophrum latum is a holarctic rove beetle (Staphylinidae: Omaliinae) first described by Mäklin in 1853. It is one of seven North American species in the genus Olophrum, distinguished from congeners by specific morphological features detailed in taxonomic revisions. The species was previously known under the synonym O. brevicolle Bernhauer. It occurs across northern regions of North America and Eurasia.
Olophrum obtectum
Olophrum obtectum is a rove beetle in the subfamily Omaliinae, endemic to eastern North America. It was formally revised and recognized as distinct from holarctic congeners in a 1983 taxonomic treatment. The species is one of seven North American Olophrum species and is distinguished by its restricted eastern distribution.
Omaliini
ocellate rove beetles
Omaliini is a tribe of rove beetles within the subfamily Omaliinae, characterized by the presence of ocelli. The tribe comprises approximately 45 genera and 450 described species distributed across all zoogeographic regions. Fossil evidence from Cretaceous amber has established the minimum age of the tribe at approximately 100 million years. The tribe exhibits considerable morphological and ecological diversity, with ongoing taxonomic research revealing numerous new species, particularly in Asia and the Papuan Region.