Nearctic
Guides
Oecleus obrieni
Oecleus obrieni is a species of planthopper in the family Cixiidae, described by O'Brien in 1982. It belongs to the tribe Oecleini, a group of small to medium-sized fulgoroid insects characterized by their association with plant roots. The species is known from Texas, USA. Like other cixiids, it likely has a life cycle involving underground nymphal stages feeding on root xylem, though specific biological details remain undocumented.
Oecleus palton
Oecleus palton is a species of planthopper in the family Cixiidae, described by Kramer in 1977. It belongs to the tribe Oecleini, a group of small to medium-sized fulgoromorphan insects characterized by their brachypterous (short-winged) condition in many species. The species is known from Arizona and represents one of several described species in the genus Oecleus, which is primarily distributed in the Nearctic and Neotropical regions.
Oemopteryx
winter stoneflies, willowflies
Oemopteryx is a genus of winter stoneflies in the family Taeniopterygidae, established by Klapálek in 1902. The genus comprises approximately six described species distributed primarily in the Nearctic region, with some records from Europe. Species are commonly known as willowflies, including the dark willowfly (O. contorta) and Canadian willowfly (O. glacialis). Recent taxonomic work has described additional Nearctic species from the southeastern United States using integrated morphological and molecular data.
Oenopion
Oenopion is a genus of darkling beetles (family Tenebrionidae) described by Champion in 1885. The genus is distributed in the Nearctic and Neotropical regions. As with many tenebrionid genera, detailed biological information remains limited in published literature.
Ofatulena duodecemstriata
Twelve-lined Ofatulena
Ofatulena duodecemstriata is a tortricid moth species in the tribe Grapholitini, first described by Walsingham in 1884 from the basionym Grapholitha duodecemstriata. The species is known by the common name "Twelve-lined Ofatulena" and has accumulated over 1,000 observations on iNaturalist, indicating it is a relatively well-documented member of its genus. It belongs to the subfamily Olethreutinae, a group of tortricid moths that includes many species associated with fruit and seed feeding. The specific epithet "duodecemstriata" refers to twelve stripes or lines, likely describing a diagnostic wing pattern feature.
Olcella
frit flies
Olcella is a genus of small frit flies in the family Chloropidae, subfamily Oscinellinae. The genus contains approximately 11 described species with highest diversity in South America, particularly Argentina. Several Nearctic species have been documented engaging in kleptoparasitism, feeding on prey fluids from insects captured by predators such as spiders, assassin bugs, and mantids. Species in this genus possess a long geniculate (elbowed) proboscis that facilitates feeding on exposed fluids without disturbing the predator.
Olethreutes versicolorana
Olethreutes versicolorana is a small tortricid moth species in the family Tortricidae, first described by Clemens in 1860. It belongs to a diverse genus of leafroller moths, many of which are associated with specific host plants. Like other members of Olethreutinae, this species is likely nocturnal and attracted to light sources. The specific epithet 'versicolorana' suggests variable coloration, though detailed species-level documentation remains limited in publicly available sources.
Omalus aeneus
Cuckoo Wasp
Omalus aeneus is a small, metallic cuckoo wasp in the family Chrysididae. Females reach 4.5–5.4 mm in body length, males 4.4–5 mm. The species exhibits striking metallic coloration ranging from blue, green, and purple to nearly black or golden, with greenish-blue abdomen and legs. This cleptoparasitic wasp has two or more generations annually in southern Europe and exploits a remarkable indirect parasitism strategy: females oviposit into living aphids, which are subsequently captured by aphid-hunting crabronid wasps and transported to their nests, where the cuckoo wasp larva develops.
Ommatius
Plumetops
Ommatius is a large and morphologically diverse genus of robber flies (Diptera: Asilidae) within the subfamily Asilinae. The genus contains numerous species distributed across multiple biogeographic regions, with particularly well-documented diversity in the Afrotropical region and the Americas. Species are organized into multiple species groups based on morphological characteristics. Like other Asilidae, members of this genus are predatory as both larvae and adults. The genus has been subject to extensive taxonomic revision due to its high species diversity and complex morphological variation.
Omorgus asper
Rough Hide Beetle
Omorgus asper is a hide beetle in the family Trogidae, first described by LeConte in 1854. The species occurs in the southern United States and Mexico, where it inhabits arid and semi-arid environments. Like other Trogidae, it is associated with carrion and animal remains, playing a role in decomposition processes.
Omorgus fuliginosus
Omorgus fuliginosus is a hide beetle in the family Trogidae, found in North and Central America. Adults measure 13–15 mm in length. The species occurs in arid and semi-arid regions from Texas south through Mexico to Costa Rica and El Salvador. Like other Trogidae, it is associated with carrion and animal remains.
Omorgus rubricans
Omorgus rubricans is a species of hide beetle in the family Trogidae, first described by Robinson in 1946. The species belongs to a genus known for its association with carrion and dung, playing important roles in decomposition. It is found in parts of Mexico and the southern United States.
Omorgus scutellaris
Omorgus scutellaris is a species of hide beetle in the family Trogidae. It occurs in the south-central United States and northern Mexico. Like other trogids, it is associated with decomposing animal matter. The species has been documented from sand dune habitats in Texas and is attracted to ultraviolet light.
Omorgus tytus
Omorgus tytus is a skin beetle in the family Trogidae, a group of beetles commonly associated with decomposing organic matter. The species has been documented across multiple U.S. states in the Nearctic region. Like other members of the genus, it is presumed to be a detritivore or scavenger, though specific ecological details remain poorly documented in the literature.
Oncerus floralis
Oncerus floralis is a scarab beetle species described by LeConte in 1856. It belongs to the subfamily Oncerinae within Scarabaeidae. The species has been recorded from California in the United States and Baja California Sur in Mexico. Very little is known about its biology or ecology.
Oncopsis aureostria
Oncopsis aureostria is a leafhopper species in the family Cicadellidae, described by Hamilton in 1983. It belongs to the tribe Macropsini within the subfamily Eurymelinae. The species is known from very few iNaturalist observations, indicating it is either rare, poorly documented, or has a restricted distribution. Like other members of the genus Oncopsis, it is likely associated with woody host plants.
Oncopsis cinctifrons
Oncopsis cinctifrons is a leafhopper species in the family Cicadellidae, tribe Macropsini. It occurs in boreal and subarctic regions of North America, with records from Alaska across Canada to Ontario. The species was described by Provancher in 1889. Like other Oncopsis species, it is associated with woody host plants.
Oncopsis flavidorsum
Oncopsis flavidorsum is a species of leafhopper in the family Cicadellidae. It has been documented in northeastern North America, with records from New Hampshire, New York, Pennsylvania, Newfoundland and Labrador, and Nova Scotia. The species was originally described by Amyot and Audinet-Serville in 1843. Like other Oncopsis species, it is associated with birch (Betula) host plants.
Oncopsis nigrinasi
Oncopsis nigrinasi is a species of leafhopper in the family Cicadellidae, subfamily Eurymelinae, and tribe Macropsini. It was described by Fitch in 1851. The species belongs to a genus known for association with birch and alder trees, though specific biological details for this species remain limited in the literature. It is part of the diverse Nearctic leafhopper fauna.
Onichodon
Onichodon is a genus of beetles in the family Eucnemidae (false click beetles), established by Newman in 1838. The genus belongs to the subfamily Macraulacinae and tribe Macraulacini. Mature larvae of at least three Nearctic species have been described, though detailed biological information remains limited. Adults are poorly documented compared to the larval stage.
Onthophagus alluvius
Onthophagus alluvius is a dung beetle species in the family Scarabaeidae, first described by Howden and Cartwright in 1963. It is native to the southern United States, particularly Texas, and extends into central and eastern Mexico. The species has been documented using dog dung as a resource. Like other Onthophagus species, it likely engages in tunneling behavior to bury dung for larval development, though specific behavioral details for this species remain limited.
Onthophagus arnetti
Onthophagus arnetti is a dung beetle species in the family Scarabaeidae, first described by Howden and Cartwright in 1963. Like other members of the genus Onthophagus, it is likely associated with mammal dung, though specific ecological details remain poorly documented. The species is known from Arizona in the southwestern United States.
Onthophagus batesi
Onthophagus batesi is a dung beetle species in the family Scarabaeidae, distributed across Central America, Mexico, and parts of the southern United States. The species belongs to a genus renowned for male horn polymorphism and complex sexual selection dynamics. Like other Onthophagus species, it is associated with mammal dung for feeding and breeding. It was described by Harold in 1867 and has also been classified under the genus Phalops.
Onthophagus brevifrons
Onthophagus brevifrons is a dung beetle species in the family Scarabaeidae, first described by George Henry Horn in 1881. The species is distributed across parts of the southern United States and northern Mexico, occurring in Arizona, Kansas, Texas, Durango, and San Luis Potosí. Like other members of the genus Onthophagus, it is a tunneling dung beetle that buries dung for larval development. The specific epithet "brevifrons" refers to the short frontal region of the head.
Onthophagus browni
Onthophagus browni is a species of dung beetle in the family Scarabaeidae, first described by Howden and Cartwright in 1963. It belongs to the large and diverse genus Onthophagus, which contains over 2,000 species worldwide. Like other members of its genus, this species is associated with mammal dung, playing a role in nutrient cycling. The species is distributed across parts of the southwestern United States and northern Mexico.
Onthophagus cavernicollis
Cave-dwelling Dung Beetle
Onthophagus cavernicollis is a dung beetle species in the family Scarabaeidae, first described by Howden and Cartwright in 1963. The species epithet "cavernicollis" suggests a possible association with cave or subterranean habitats, though specific ecological details remain limited. Like other members of the genus Onthophagus, it is presumed to be a dung-feeding beetle involved in nutrient recycling. The species has been documented in the south-central United States.
Onthophagus cynomysi
Onthophagus cynomysi is a species of dung beetle in the family Scarabaeidae, first described by Brown in 1927. It is part of the large and diverse genus Onthophagus, which contains hundreds of species distributed worldwide. Like other members of this genus, it is likely associated with mammalian dung as a food and breeding resource, though specific ecological details remain poorly documented. The species is known from scattered records in the south-central United States.
Onthophagus durangoensis
Onthophagus durangoensis is a dung beetle species in the family Scarabaeidae, native to mountainous regions of Mexico and extending into the southwestern United States. It inhabits montane forests and has been documented in states across central and western Mexico, as well as in Arizona and New Mexico. Like other members of its genus, it is associated with mammal dung and plays a role in nutrient cycling in its ecosystems. The species was described by Balthasar in 1939 and is considered valid and accepted in current taxonomy.
Onthophagus hoepfneri
Onthophagus hoepfneri is a dung beetle species in the family Scarabaeidae, first described by Harold in 1869. The species occurs across parts of Mexico, Central America, and the southwestern United States. As a member of the genus Onthophagus, it is likely a tunneler-type dung beetle that buries dung for larval development, though specific behavioral and ecological details for this species remain poorly documented.
Onthophagus oklahomensis
Onthophagus oklahomensis is a species of dung beetle in the family Scarabaeidae, first described by Brown in 1927. It belongs to the genus Onthophagus, a large and diverse group of tunneler dung beetles known for their ecological role in nutrient recycling. The species is documented from the southeastern and south-central United States, with records extending from Oklahoma eastward to the Atlantic coast. Like other members of its genus, it is presumed to be associated with mammal dung, though specific ecological studies on this species are limited.
Onthophagus schaefferi
Onthophagus schaefferi is a species of dung beetle in the family Scarabaeidae, described by Howden and Cartwright in 1963. It belongs to the genus Onthophagus, a large and diverse group of dung beetles known for their ecological role in nutrient recycling and their complex sexual selection dynamics involving horned males. The species has been recorded from Texas in the United States and Veracruz in Mexico, placing it within the Nearctic and Neotropical biogeographic realms. Like other members of its genus, it likely participates in dung burial behavior, though specific details for this species remain limited.
Onthophagus subaeneus
Onthophagus subaeneus is a species of dung beetle in the family Scarabaeidae. It belongs to the diverse genus Onthophagus, which includes species known for horned males and brood ball construction. The species has been documented across a broad range of eastern and central United States. Specific ecological details for this species remain limited in available sources.
Onthophagus subopacus
Onthophagus subopacus is a dung beetle species in the family Scarabaeidae, described by Robinson in 1940. The species is recorded from the southwestern United States (Arizona) and western Mexico (Durango, Jalisco, Sonora). As a member of the genus Onthophagus, it likely participates in dung burial and nutrient cycling, though specific ecological details remain poorly documented.
Onthophagus subtropicus
Onthophagus subtropicus is a species of dung beetle in the family Scarabaeidae, first described by Howden and Cartwright in 1963. It belongs to the large genus Onthophagus, which contains over 2,000 species of tunneling dung beetles distributed worldwide. The species name suggests an association with subtropical regions. Like other members of its genus, it is presumed to feed on mammal dung and to exhibit sexual dimorphism with horned males, though specific studies on this species are limited.
Onychelus
Onychelus is a genus of millipedes in the family Atopetholidae, established by Cook in 1904. The genus contains at least three described species: Onychelus michelbacheri, Onychelus obustus, and Onychelus suturatus. These millipedes belong to the order Spirobolida, a group of large, cylindrical millipedes commonly known as giant millipedes or round-backed millipedes.
Onychomira
Onychomira is a genus of darkling beetles in the family Tenebrionidae, established by Campbell in 1984. It is a small genus with limited documented species, restricted to the Nearctic region. Members are ground-dwelling beetles associated with arid and semi-arid environments typical of many tenebrionids.
Opetiophora straminea
Opetiophora straminea is a species of frit fly in the family Chloropidae, described by Hermann Loew in 1872. It belongs to a small genus of grass flies whose biology remains poorly documented. Records indicate it occurs in the Nearctic region.
Ophiderma compacta
Ophiderma compacta is a treehopper species in the family Membracidae, described by Gibson and Wells in 1917. The genus Ophiderma belongs to the tribe Smiliini within the subfamily Smiliinae, a group characterized by diverse pronotal modifications. Species in this genus are part of the Nearctic treehopper fauna, with records from the southwestern United States.
Ophraea rugosa
Ophraea rugosa is a leaf beetle in the family Chrysomelidae, first described by Jacoby in 1886. The species has a transcontinental distribution spanning from the southwestern United States through Mexico to Central America. It is one of approximately 13 species in the genus Ophraea, a group of leaf beetles primarily distributed in the Neotropical and Nearctic regions.
Ophraella notulata
Marsh Elder Leaf Beetle
Ophraella notulata is a Nearctic skeletonizing leaf beetle in the family Chrysomelidae, found in Gulf Coast states of the United States and Mexico. It was previously described as O. integra (LeConte), now synonymized with O. notulata (Fabricius). The species is specialized on host plants in the Asteraceae family, primarily Iva frutescens (marsh elder), with documented ability to utilize Ambrosia artemisiifolia (ragweed) as an alternative host. Research has demonstrated complex transgenerational effects of host plant on offspring fitness and behavior.
Optioservus
Optioservus is a former genus of riffle beetles (family Elmidae) established by Sanderson in 1954. As of 2021, it is recognized as a junior synonym of Heterlimnius. The genus formerly contained approximately 13 species distributed in the Nearctic region, including several species described by White in 1978. Species-level identification historically relied on variable external characters; a 1978 revision established more reliable diagnostic criteria based on male genitalia, elytral patterns, and geographic distribution.
Optioservus castanipennis
Optioservus castanipennis is a species of riffle beetle in the family Elmidae, first described by Fall in 1925. It belongs to a genus of small aquatic beetles inhabiting running water systems. The species is recognized as part of the Nearctic fauna and has been subject to taxonomic revision based on male genitalia and elytral characteristics.
Optioservus heteroclitus
Optioservus heteroclitus is a species of riffle beetle in the family Elmidae, described by White in 1978 as part of a taxonomic revision of Nearctic Optioservus. The species was distinguished based on male genitalia, elytral patterns and shape, and geographic distribution. Like other elmid beetles, it is associated with aquatic environments, specifically flowing water habitats.
Optioservus immunis
Optioservus immunis is a species of riffle beetle in the family Elmidae, first described by Fall in 1925. It is one of thirteen Nearctic species in the genus, distinguished from congeners primarily by male genitalia and elytral pattern. The species was previously known under the synonym Optioservus cryophilus.
Optioservus phaeus
Scott optioservus riffle beetle
Optioservus phaeus is a species of riffle beetle (family Elmidae) described by White in 1978. It belongs to a genus of small aquatic beetles inhabiting running waters. The species was described as part of a taxonomic revision based on male genitalia, elytral patterns, and geographic distribution. It is known from a highly restricted range in Kansas.
Optioservus seriatus
Optioservus seriatus is a species of riffle beetle in the family Elmidae, first described by LeConte in 1874. It is one of thirteen Nearctic species in the genus Optioservus, a group whose taxonomy was historically complicated by highly variable external morphology. The species occurs in North America, with records from western Canada including Alberta and British Columbia.
Oreoneta
A genus of dwarf spiders (family Linyphiidae) established in 1894, comprising approximately 30 species distributed across cold-temperate and Arctic regions of the Northern Hemisphere. Most species inhabit high-latitude or high-altitude environments. The genus was revised extensively by Saaristo & Marusik in 2004, resulting in numerous new species descriptions.
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argentia
Orgamara argentia is a species of planthopper in the family Dictyopharidae, described by Ball in 1937. It belongs to the subfamily Orgeriinae, a group commonly known as orgeriine planthoppers. The species has been recorded from Arizona, USA. As a member of the Hemiptera, it possesses piercing-sucking mouthparts typical of true bugs.
Orimarga mirabilis
Orimarga mirabilis is a crane fly species in the family Limoniidae, described by Osten Sacken in 1878. The species is known from the Nearctic and Neotropical regions, with records from the eastern and southern United States (Indiana to Georgia, south to Texas, Louisiana, and Florida) and Cuba. It is one of approximately 48 observed species in the genus Orimarga.
Orizabus pinalicus
Orizabus pinalicus is a rhinoceros beetle described in 2011 from the southwestern United States. It belongs to the genus Orizabus, a group of relatively small dynastine scarabs. The species is known from limited records in Arizona and Texas.