Carabidae
Guides
Nippononebria virescens
greenish false gazelle beetle
Nippononebria virescens is a species of ground beetle in the family Carabidae, commonly known as the greenish false gazelle beetle. It is native to western North America, where it inhabits meadow habitats. Adults are nocturnal and carnivorous. The species is relatively poorly documented, with limited observational records.
Nomius
Nomius is a genus of ground beetles (Carabidae) in the tribe Psydrini, subfamily Psydrinae. The genus contains at least one well-documented species, Nomius pygmaeus, which exhibits a remarkable disjunct distribution across North America, Europe, and Asia. Members are characterized by their isolated phylogenetic position within the Harpalinae subfamily.
Nomius pygmaeus
stink beetle, stinking beetle
Nomius pygmaeus is a small ground beetle in family Carabidae, the sole representative of tribe Psydrini. Adults emit a distinctive repugnant odor when captured or disturbed, earning the common name "stink beetle." The species exhibits a remarkably disjunct global distribution, occurring in North America from Canada to California and sporadically across parts of Europe and southwestern Asia.
Nothoderis
Nothoderis is a genus of ground beetles (Carabidae) described in 2016 by Boyd and Erwin. It belongs to the tribe Bembidiini within the subfamily Trechinae. The genus is part of the diverse ground beetle fauna, with very few documented observations. As a recently described genus, its species composition and biology remain poorly documented.
Notiobia
Notiobia is a genus of ground beetles in the family Carabidae, comprising at least 100 species. The genus was established by Perty in 1830 and is classified within the tribe Anisodactylini. Brazilian species belong to at least three distinct species groups distributed from Brazil through northwestern South America and Central America to Mexico. At least one species, Notiobia nebrioides, has been documented as a member of the seed-feeding guild at fruit falls in Amazonian rainforest.
Notiobia cephala
Notiobia cephala is a species of ground beetle in the family Carabidae, first described by Casey in 1914. It is native to North America, with distribution records from the United States. As a member of the genus Notiobia, it belongs to a group of small to medium-sized carabid beetles often associated with riparian or moist habitats.
Notiobia mexicana
Notiobia mexicana is a species of ground beetle in the family Carabidae. It occurs across a broad geographic range from the southwestern United States through Mexico and Central America to Panama. As a member of the tribe Notiobiini, it belongs to a group of carabid beetles often associated with riparian and wetland habitats.
Notiobia purpurascens
Notiobia purpurascens is a species of ground beetle in the family Carabidae, found in North America. The specific epithet "purpurascens" refers to a purplish coloration. As a member of the tribe Notiobiini, it belongs to a group of carabid beetles characterized by particular morphological features. The species has been documented from both the United States and Mexico based on distribution records.
Notiobia sayi
Notiobia sayi is a species of ground beetle in the family Carabidae, first described by Blatchley in 1910. It occurs in North America, with confirmed records from Canada and the United States. As a member of the genus Notiobia, it belongs to a group of ground beetles whose ecology and natural history remain poorly documented in the scientific literature. The species is represented by 76 observations on iNaturalist, indicating it is encountered with moderate frequency by naturalists.
Notiophilus aeneus
Brassy Big-eyed Beetle
Notiophilus aeneus, commonly called the brassy big-eyed beetle, is a small ground beetle in the family Carabidae. Adults measure approximately 5–6 mm in length. The species is characterized by its dark coloration with a brassy metallic tinge and notably large eyes. It occurs in North America and exhibits diurnal activity during spring and summer months.
Notiophilus aquaticus
black-legged springtail-stalker
Notiophilus aquaticus is a Holarctic ground beetle in the family Carabidae, commonly known as the black-legged springtail-stalker. It occupies diverse open and semi-open habitats including moraines, meadows, and forest edges. The species is one of several in the genus Notiophilus, which are recognized for their specialized predation on springtails (Collembola).
Notiophilus borealis
northern big-eyed beetle
Notiophilus borealis is a ground beetle in the family Carabidae, commonly known as the northern big-eyed beetle. The species has a Holarctic distribution, occurring in Europe, Northern Asia (excluding China), and North America. It inhabits open or partially shaded gravelly and sandy ground with sparse vegetation, including moraines, meadows, roadsides, and open forests. The genus Notiophilus is characterized by large, prominent eyes, an adaptation for visual predation.
Notiophilus intermedius
intermediate big-eyed beetle
Notiophilus intermedius is a species of ground beetle in the family Carabidae, described by Lindroth in 1955. It is commonly known as the intermediate big-eyed beetle. The species occurs in northern North America, including Alaska and several Canadian provinces. Adults are brachypterous (short-winged) and primarily diurnal in activity.
Notiophilus nitens
bright big-eyed beetle
Notiophilus nitens is a ground beetle in the family Carabidae, commonly known as the bright big-eyed beetle. It occurs in western North America, with documented populations in British Columbia, Idaho, Montana, Oregon, and Washington. Adults exhibit wing dimorphism, with some individuals having reduced wings (brachypterous) and others fully developed wings (macropterous). The species inhabits open, disturbed habitats including grasslands and agricultural areas.
Notiophilus simulator
Fall's big-eyed beetle
Notiophilus simulator is a ground beetle in the family Carabidae, commonly known as Fall's big-eyed beetle. The species exhibits wing dimorphism, with populations containing both short-winged (brachypterous) and long-winged (macropterous) individuals. It inhabits upland to mountainous environments across North America.
Notiophilus sylvaticus
forest big-eyed beetle
Notiophilus sylvaticus is a ground beetle in the family Carabidae, commonly known as the forest big-eyed beetle. It is native to North America and exhibits wing dimorphism, with populations containing both short-winged (brachypterous) and long-winged (macropterous) individuals. Adults are gregarious and primarily active during daylight hours. The species inhabits open forests and meadows.
Odacanthini
Odacanthini is a tribe of ground beetles in the family Carabidae, comprising more than 40 genera and over 680 described species. The tribe exhibits broad geographic distribution across tropical and subtropical regions including the Americas, Africa, Asia, and the Pacific. Several genera within Odacanthini, such as Colliuris, Ophionea, and Dobodura, have been subject to recent taxonomic revision due to their morphological diversity and complex species boundaries.
Olisthopus
Olisthopus is a genus of ground beetles in the family Carabidae, subfamily Platyninae. The genus is native to the Palearctic region, with records from Europe, the Near East, and North Africa. Additional distribution records include Scandinavia (Denmark, Norway, Sweden) and North America (Vermont, USA). As a member of Platyninae, species in this genus are likely associated with ground-dwelling habits in various terrestrial habitats.
Olisthopus micans
Olisthopus micans is a ground beetle species in the family Carabidae, first described by LeConte in 1846. It belongs to the subfamily Platyninae and is native to North America. The genus Olisthopus comprises small to medium-sized ground beetles, though specific ecological details for this species remain poorly documented.
Olisthopus parmatus
Olisthopus parmatus is a ground beetle species in the family Carabidae, first described by Thomas Say in 1823. It is native to North America, with documented occurrence in Canada and the United States. The species includes two recognized subspecies: O. p. parmatus and O. p. iterans. Like other members of the genus Olisthopus, it belongs to the subfamily Platyninae within the diverse ground beetle radiation.
Omophron
Round sand beetles
Omophron is a genus of ground beetles (Carabidae) and the sole extant genus in the subfamily Omophroninae. It is widely distributed across the Northern Hemisphere with southern limits extending to Guatemala and Hispaniola in the Americas, South Africa and Madagascar in Africa, and Malaysia and the Philippines in Asia. The genus includes multiple subgenera, with taxonomic revisions documenting substantial species diversity in the Afrotropical region.
Omophron labiatum
large-lipped round sand beetle
Omophron labiatum is a ground beetle species in the family Carabidae, commonly known as the large-lipped round sand beetle. It occurs in North America, where it inhabits margins of ponds, lakes, and rivers in coastal lowlands. Adults are nocturnal and gregarious, hiding in ground burrows during daylight hours. The larvae have been reported to feed on grains and corn, leading to occasional pest status in agricultural contexts.
Omophron nitidum
Shiny Round Sand Beetle
Omophron nitidum is a small ground beetle native to the United States. Adults are nocturnal, sheltering in burrows and leaf litter during daylight hours. The species has been recorded breeding from late summer through December. It is one of several North American species in the genus Omophron, which are adapted to sandy habitats.
Omus
Night-stalking Tiger Beetles
Omus is a genus of flightless, nocturnal tiger beetles (subfamily Cicindelinae) endemic to the west coast of North America. Members are uniformly dark-colored and characterized by reduced or absent hind wings, restricting them to ground-dwelling locomotion. The genus comprises at least five recognized species, including O. audouini, O. californicus, O. cazieri, O. dejeanii, and O. submetallicus. These beetles occupy diverse habitats from forest floors to upper salt marshes, with some species showing strong associations with specific plant communities.
flightlessnocturnalwest-coast-endemictiger-beetlesalt-marshforest-floorprolonged-copulationconservation-concernCanada-species-at-riskmorphological-character-displacementAmblycheiliniCicindelinaeCarabidaeColeopteralarval-burrowsDouglas-aster-indicator-speciesniche-partitioningmale-mandible-dimorphismsyn-copulatory-courtshiprain-shadow-habitatSierra-NevadaCascade-RangeCoast-RangeBritish-ColumbiaOregonCaliforniaWashingtonOmus californicus
California night-stalking tiger beetle
Omus californicus is a nocturnal tiger beetle species endemic to western North America, recognized for its distinctive night-stalking predatory behavior. The species exhibits notable taxonomic complexity with six recognized subspecies distributed across California, Oregon, and adjacent regions. Adults are elusive, active primarily during nighttime hours, and are associated with forested and montane habitats. The species has been subject to taxonomic confusion with related taxa, particularly regarding subspecies boundaries.
Omus californicus californicus
California Night-stalking Tiger Beetle
Omus californicus californicus is the nominate subspecies of the California night-stalking tiger beetle, a flightless, nocturnal carabid beetle endemic to California. Adults are active primarily in spring and early summer, with larvae occupying permanent burrows in soil. The species exhibits strong habitat fidelity to specific substrates and moisture conditions. Unlike diurnal tiger beetles in the genus Cicindela, Omus species are crepuscular to nocturnal hunters that do not rely on vision for prey capture.
Omus californicus subcylindricus
Subcylindrical Night-stalking Tiger Beetle
Omus californicus subcylindricus is a subspecies of night-stalking tiger beetle in the family Carabidae. It is one of several subspecies within the Omus californicus complex, which exhibits considerable morphological and geographic variation across its range in western North America. The subspecies was described by Nunenmacher in 1940 and is distinguished by its subcylindrical body form compared to other members of the complex.
Omus cazieri
Mount Ashland Night-stalking Tiger Beetle, Cazier's night-stalking tiger beetle
Omus cazieri is a nocturnal tiger beetle species endemic to the western United States, specifically known from southwestern Oregon and adjacent northern California. It belongs to the genus Omus, a group of flightless, night-active tiger beetles distinguished by their cylindrical body form and reduced eyes. The species is named in honor of entomologist Mont Cazier.
Omus sequoiarum
Omus sequoiarum is a species of flightless tiger beetle in the genus Omus, described by Crotch in 1874. It is currently treated as a synonym of Omus californicus californicus, though some sources maintain it as a distinct species. Like other Omus species, it is nocturnal and associated with forested habitats in western North America. The species epithet 'sequoiarum' references its association with sequoia (redwood) forests.
Onichodon rugicollis
Onichodon rugicollis is a species of ground beetle in the family Carabidae. It belongs to the tribe Lebiini, a diverse group of small to medium-sized carabid beetles. The species is characterized by its distinctive sculptured pronotum, which contributes to its specific epithet. Like other members of its genus, it is likely associated with ground-level habitats in forested or vegetated environments.
Onota
Onota is a genus of ground beetles in the family Carabidae, established by Chaudoir in 1873. It belongs to the subtribe Agrina within the tribe Lebiini, subfamily Lebiinae. The genus is poorly documented in modern literature, with minimal observational records available.
Onota angulicollis
Onota angulicollis is a species of ground beetle in the family Carabidae, originally described as Lebia angulicollis by Reiche in 1842. It is distributed across the Americas from North America through Central America to South America. As a member of the subfamily Lebiinae, it belongs to a group of carabid beetles commonly known as colorful foliage ground beetles, many of which are associated with vegetation rather than ground-dwelling habits. The specific epithet angulicollis refers to the angular or angled collar (pronotum) characteristic of this species.
Oodes
Oodes is a genus of ground beetles (Carabidae) in the tribe Oodini. The genus has undergone significant taxonomic revision, with many species formerly classified in Oodes now placed in three new genera: Pseudoodes, Sundaoodes, and Nothoodes. The genus currently comprises seven recognized species, with five in Oodes s.str. and two in the subgenus Lachnocrepis. Oodes species are distributed across the Palaearctic and Oriental regions.
Oodes amaroides
Oodes amaroides is a ground beetle species in the family Carabidae, first described by Dejean in 1831. It belongs to the subfamily Licininae and tribe Oodini. The species is documented from North America, with occurrence records from Canada and the United States. As a member of the genus Oodes, it shares characteristics with other oodine ground beetles, though specific biological details remain limited in published literature.
Oodes fluvialis
Oodes fluvialis is a ground beetle species in the family Carabidae, first described by LeConte in 1863. It belongs to the tribe Oodini within the subfamily Licininae. The species occurs in North America, with documented presence in Canada and the United States. Very little specific biological information has been published for this species.
Oodini
Oodini is a tribe of ground beetles (Carabidae: Harpalinae) containing over 400 species in 43 genera, with highest diversity in tropical Africa. Members are generally associated with standing water habitats. The tribe is distinguished by two diagnostic morphological characters: a laterally coadunate metepisternum and an elytral ridge formed by fusion of elytral intervals 7 and 8.
Oodinus
Oodinus is a genus of ground beetles in the family Carabidae, subfamily Licininae. The genus was established by Motschulsky in 1865 and contains at least ten described species distributed primarily in the Neotropical region. Species within this genus are small to medium-sized carabids with limited available ecological documentation.
Oodinus alutaceus
Oodinus alutaceus is a ground beetle species in the family Carabidae, originally described by Henry Walter Bates in 1882. It belongs to the tribe Oodini within the subfamily Licininae. The species has a documented distribution spanning parts of North and Central America, including Mexico and the United States.
Opisthius
Opisthius is a monotypic genus of ground beetles in the family Carabidae, containing the single species Opisthius richardsoni. The genus is classified within the subfamily Nebriinae and tribe Opisthiini. Its sole species is distributed across northern North America, from Alaska and Yukon south to California and New Mexico. The genus is notable for its strong superficial resemblance to tiger beetles (Cicindelinae), which has led to frequent misidentification by collectors.
Opisthius richardsoni
Opisthius richardsoni is a ground beetle in the family Carabidae, native to northern North America. It is frequently mistaken for tiger beetles (Cicindelinae) due to its superficial resemblance, a common identification error among collectors. The species occurs across Alaska, Canada, and the northern United States.
Oxycrepis crenata
Oxycrepis crenata is a species of ground beetle in the family Carabidae, first described by LeConte in 1853. It is native to North America. The genus Oxycrepis is part of the tribe Harpalini, a diverse group of ground beetles. Available information on this species is limited to taxonomic records and basic distribution data.
Oxycrepis duryi
Oxycrepis duryi is a species of ground beetle in the family Carabidae, first described by Wright in 1939. It is found in North America, with records from the United States. Like other members of the genus Oxycrepis, it is a ground-dwelling beetle, though specific details about its ecology and behavior remain poorly documented in the scientific literature.
Oxycrepis erratica
Oxycrepis erratica is a species of ground beetle in the family Carabidae. It is found in the United States.
Oxycrepis intercepta
Oxycrepis intercepta is a species of ground beetle in the family Carabidae. It occurs in North America, with records from Mexico and the United States. As a member of the tribe Harpalini, it belongs to a diverse group of predominantly ground-dwelling beetles. Published information on its biology and ecology remains limited.
Oxycrepis recta
Oxycrepis recta is a ground beetle species in the family Carabidae, first described by Thomas Say in 1823. It is known from the United States, though specific details about its biology and ecology remain poorly documented. The genus Oxycrepis is part of the diverse carabid fauna of North America.
Oxycrepis saphyrina
Oxycrepis saphyrina is a species of ground beetle in the family Carabidae, tribe Lebiini. It was described by Chaudoir in 1843. Records indicate occurrence in the United States, though detailed biological information remains limited. The genus Oxycrepis comprises small to medium-sized carabid beetles, many of which inhabit forest floor habitats.
Oxycrepis sculptilis
Oxycrepis sculptilis is a species of ground beetle in the family Carabidae, originally described as Loxandrus sculptilis by Bates in 1884. It is distributed across parts of North America, with records from the United States, Mexico, and Panama. Like other members of Carabidae, it is a terrestrial beetle, though detailed biological information for this species is limited.
Oxycrepis velocipes
Oxycrepis velocipes is a ground beetle species in the family Carabidae, originally described as Loxandrus velocipes by Casey in 1918. It belongs to a genus of small to medium-sized carabid beetles found primarily in North America. The species is documented from Canada and the United States, though specific ecological details remain poorly recorded in the scientific literature.
Oxydrepanus
Oxydrepanus is a genus of ground beetles in the family Carabidae, tribe Clivinini, subtribe Reicheiina. The genus was established by Putzeys in 1867 and contains approximately 17 described species distributed across the Americas, with records from Brazil, Mexico, Cuba, and other regions. Species are small to minute in size and have been documented from the mid-19th century to recent descriptions in 2018. The genus is taxonomically placed within the diverse carabid subfamily Scaritinae, which includes many soil-dwelling beetles.
Oxypselaphus
Oxypselaphus is a genus of ground beetles in the family Carabidae, established by Chaudoir in 1843. The genus comprises four recognized species distributed across the Northern Hemisphere, including Europe and North America. Members of this genus are classified within the subfamily Platyninae, tribe Platynini. The genus includes both Palearctic and Nearctic species, with O. obscurus being the most widespread and historically documented species.