Western-north-america
Guides
Oecleus planus
Oecleus planus is a species of planthopper in the family Cixiidae, first described by Ball and Klingenberg in 1935. It belongs to the tribe Oecleini within the subfamily Cixiinae. Like other cixiids, this species is part of the diverse Auchenorrhyncha suborder of Hemiptera, characterized by their piercing-sucking mouthparts and often cryptic habits. The genus Oecleus contains multiple species distributed primarily in western North America.
Oeclidius nanus
Oeclidius nanus is a species of planthopper in the family Meenoplidae, first described by Van Duzee in 1914. The specific epithet "nanus" (Latin for "dwarf") suggests small body size, a trait common among members of this genus. The species has been recorded from western North America including the southwestern United States and northwestern Mexico.
Oedaleonotus enigma
Valley Grasshopper
Oedaleonotus enigma, the valley grasshopper, is a large, colorful spur-throated grasshopper native to western North America. It is a significant rangeland pest capable of reaching outbreak densities exceeding 20 adults per square yard. The species exhibits wing dimorphism, with both short-winged (brachypterous) and long-winged (macropterous) forms occurring in populations. It is notable for early spring hatching and a relatively long nymphal period of 42-50 days due to cool temperatures and six instars rather than the typical five.
Oedaleonotus orientis
Oedaleonotus orientis is a species of spur-throated grasshopper in the family Acrididae, first described by Hebard in 1920. It belongs to the subfamily Melanoplinae, a group characterized by the presence of a ventral spur on the throat. The species is found in North America, with records from Nevada. Like other members of the genus Oedaleonotus, it is a rangeland species associated with semiarid habitats.
Oedaleonotus pinctus
Oedaleonotus pinctus is a species of spur-throated grasshopper in the family Acrididae, subfamily Melanoplinae. It is one of approximately nine species in the genus Oedaleonotus, a group primarily distributed in California and the western United States. The genus is characterized by short tegmina that are typically shorter than the pronotum and often narrow and widely separated. O. pinctus was described by Scudder in 1899 and is currently accepted as a valid species.
Oedaleonotus tenuipennis
Oedaleonotus tenuipennis is a species of spur-throated grasshopper in the family Acrididae, described by Scudder in 1897. It is native to western North America, primarily California. The species is distinguished from congeners by its narrow, slender tegmina (forewings) that are shorter than the pronotum. Seven other species in the genus Oedaleonotus share this characteristic short-winged morphology, though O. tenuipennis is differentiated by specific structural details of the tegmina.
Oedemasia salicis
Western Red-Humped Caterpillar Moth
Oedemasia salicis is a species of prominent moth in the family Notodontidae. The common name refers to the distinctive red hump on its caterpillar. Adults are nocturnal and attracted to light. The species is associated with willow and poplar host plants.
Oedomerus corallipes
Redshanked Grasshopper
Oedomerus corallipes is a large grasshopper species found in western North America. It was formerly classified under the genus Xanthippus but has been reclassified to Oedomerus based on modern taxonomic revisions. The species exhibits geographic variation in its life cycle, with northern populations requiring two years to develop while southern populations complete their cycle in one year. Adults are present in spring and are known for their conspicuous flight displays accompanied by loud crepitation.
Oeneis nevadensis
Great Arctic, Nevada Arctic, great grayling, Felder's Arctic, Pacific Arctic
Oeneis nevadensis, commonly called the great Arctic, is the largest western Arctic butterfly with a wingspan of 5.1–6.3 cm. It is distinguished by its biennial life cycle, with adults appearing only in even-numbered years for most populations. The species occurs in high-elevation habitats of the Cascade Mountains from southern British Columbia to northern California, where it represents the southernmost range limit for this Arctic group in western North America.
Oeneis uhleri uhleri
Uhler's Arctic
Oeneis uhleri uhleri is a subspecies of Arctic butterfly in the family Nymphalidae. It occurs in the western United States and Canada, inhabiting high-elevation mountain environments. Like other members of the genus Oeneis, it is associated with alpine and subalpine habitats. The species has been documented from the Rocky Mountain region northward into the Canadian prairie provinces.
Ogcodes incultus
Ogcodes incultus is a species of small fly in the family Ogcodidae, a group commonly known as spider flies due to their parasitic association with spiders. The genus Ogcodes contains species that are specialized parasitoids, with larvae developing on or within arachnid hosts. Ogcodes incultus is one of several North American species in this genus, though detailed biological studies remain limited. Adults are generally inconspicuous and seldom encountered by casual observers.
Oidaematophorus balsamorrhizae
Balsamroot Plume Moth
Oidaematophorus balsamorrhizae is a plume moth in the family Pterophoridae, first described by James Halliday McDunnough in 1939. The species is restricted to western North America and is associated with Balsamorhiza host plants. Adults have a wingspan of 23–25 mm. The common name references its larval host relationship with balsamroot plants.
Oidaematophorus grisescens
Wormwood Plume Moth
Oidaematophorus grisescens is a plume moth in the family Pterophoridae, commonly known as the Wormwood Plume Moth. It is found across western North America from Mexico through the western United States to western Canada. The species is associated with Artemisia host plants. Adults have a wingspan of 20–29 mm and exhibit characteristic grey coloration with white spotting.
Oidaematophorus occidentalis
Western Plume Moth
A plume moth in the family Pterophoridae, found in western North America from Alberta and British Columbia south to Arizona and Utah. The species exhibits considerable color variation but generally displays creamy white to dull tawny-brown coloration with characteristic brown markings on the forewings. The wingspan ranges from 26–29 mm. Larvae feed on Aster, Grindelia, and Helianthus species.
Oidaematophorus phaceliae
Phacelia Plume Moth
Oidaematophorus phaceliae is a plume moth distributed across western North America from Yukon to California and Baja California. Adults have a wingspan of approximately 25 mm with distinctive fawn-brown forewings marked with white and smoky scaling. Larvae feed on Hydrophyllaceae plants including Phacelia and Hydrophyllum virginianum, with pupation occurring on dead leaves of the host plant.
Okanagana
Okanagana is a genus of cicadas comprising approximately 60 described species, primarily distributed in western North America. Species in this genus are generally arid- or cold-adapted, with most occurring in western U.S. states and Canada. The genus includes notable exceptions such as O. viridis, which inhabits temperate deciduous forests of the southeastern United States. Okanagana species are characterized by their acoustic communication, with males producing species-specific calling songs. Several species have been studied as hosts for specialized parasitoids, including the sarcophagid fly Emblemasoma auditrix, which locates hosts through phonotaxis to male calling songs.
Okanagana annulata
Okanagana annulata is a small cicada species in the family Cicadidae, described by Davis in 1935. It belongs to the genus Okanagana, a group of annual cicadas found primarily in western North America. The species is documented from several western U.S. states including California, Colorado, Idaho, Montana, and Nevada. Like other Okanagana species, it is presumed to be an annual cicada with a multi-year life cycle spent largely underground as nymphs feeding on xylem fluids from plant roots.
Okanagana arctostaphylae
Okanagana arctostaphylae is a small cicada species described by Van Duzee in 1915. It is native to California and belongs to the genus Okanagana, which contains numerous western North American cicada species. Like other Okanagana species, it is an annual cicada with a life cycle completed within a single year rather than the multi-year periodical cycles seen in Magicicada. The specific epithet arctostaphylae suggests an association with manzanita (Arctostaphylos), though the nature of this relationship requires confirmation.
Okanagana aurora
Okanagana aurora is a species of cicada described by William T. Davis in 1936. It belongs to the genus Okanagana, a group of cicadas found primarily in western North America. The species is known from California and Nevada. Like other members of its genus, it is presumed to be an annual cicada rather than a periodical species.
Okanagana bella
Mountain Cicada
Okanagana bella, commonly known as the mountain cicada, is a cicada species in the family Cicadidae. It was described by Davis in 1919. The species is found in western North America, with documented occurrences in Alberta, Arizona, British Columbia, California, Colorado, and other mountainous regions. As an annual cicada, it does not exhibit the synchronized mass emergence patterns seen in periodical cicadas.
Okanagana canescens
Okanagana canescens is a species of annual cicada in the family Cicadidae, first described by Van Duzee in 1915. It belongs to the genus Okanagana, which comprises numerous species distributed across western North America. The species is documented from California and Washington based on occurrence records. As with other Okanagana species, it is presumed to have an annual life cycle rather than the periodical emergence pattern seen in Magicicada species.
Okanagana formosa
Okanagana formosa is a species of annual cicada in the family Cicadidae, described by Davis in 1926. It belongs to the western North American cicada genus Okanagana, which comprises approximately 60 species. Like other Okanagana species, it is not a periodical cicada and does not exhibit synchronized mass emergence patterns. The species has been documented from California, Nevada, and Utah.
Okanagana fratercula
Brother's Band-winged Grasshopper
Okanagana fratercula is a species of cicada described by Davis in 1915. It belongs to the genus Okanagana within the family Cicadidae. The species has been recorded from western North America including Alberta, British Columbia, California, Colorado, and Idaho. As a member of the Tibicininae subfamily, it shares characteristics with other Okanagana species, though specific ecological details remain limited in published literature.
Okanagana fumipennis
Okanagana fumipennis is a cicada species in the family Cicadidae, described by Davis in 1932. It belongs to the genus Okanagana, a group of North American cicadas distributed primarily in western regions of the continent. The specific epithet "fumipennis" (smoky-winged) suggests dark or smoky wing coloration. Like other cicadas, it has a life cycle involving nymphal stages underground and adult emergence, though specific biological details for this species remain poorly documented in available literature.
Okanagana gibbera
Okanagana gibbera is a species of cicada in the family Cicadidae, described by Davis in 1927. It is found in western North America, with confirmed records from California, Colorado, Idaho, Montana, and Nevada. Like other members of the genus Okanagana, it is an annual cicada with a multi-year life cycle spent primarily underground as a nymph.
Okanagana luteobasalis
Okanagana luteobasalis is a small annual cicada species described by Davis in 1935. It belongs to the genus Okanagana, a diverse group of western North American cicadas. Distribution records indicate occurrence across the western United States and Canada, including Alberta, British Columbia, California, Colorado, and Idaho. As with other Okanagana species, it likely inhabits open, dry habitats, though specific ecological details remain poorly documented.
Okanagana magnifica
Okanagana magnifica is a species of cicada in the family Cicadidae, described by Davis in 1919. It is native to western North America, with documented occurrences in Arizona, California, Colorado, Nevada, and New Mexico. The species belongs to the genus Okanagana, which comprises annual cicadas rather than periodical species. As with other Okanagana species, it likely inhabits arid and semi-arid environments characteristic of its southwestern range.
Okanagana mariposa
Okanagana mariposa is a cicada species in the family Cicadidae described by Davis in 1915. The species is native to North America and is one of approximately 65 cicada species found in California. Two subspecies are recognized: O. m. mariposa and O. m. oregonensis. Like other members of the genus Okanagana, it is an annual cicada rather than a periodical species.
Okanagana napa
Okanagana napa is a species of cicada in the family Cicadidae, first described by Davis in 1919. The species epithet "napa" refers to Napa County, California, indicating its type locality. It belongs to the genus Okanagana, a group of cicadas distributed primarily in western North America. Like other cicadas, it is presumed to have a subterranean nymphal stage and adult emergence tied to seasonal patterns.
Okanagana nigrodorsata
Okanagana nigrodorsata is a species of cicada described by Davis in 1923. It belongs to the genus Okanagana, a diverse group of annual cicadas found in western North America. The species name 'nigrodorsata' refers to its dark dorsal coloration. Like other Okanagana species, it is an annual cicada with a multi-year life cycle spent primarily underground as nymphs.
Okanagana noveboracensis
Aspen Cicada
Okanagana noveboracensis, commonly known as the Aspen Cicada, is a species of cicada in the family Cicadidae. It is distributed across western North America, with records from Alberta, British Columbia, California, Colorado, and Idaho. As a member of the genus Okanagana, it belongs to a group of annual cicadas rather than the periodical cicadas. The species is associated with aspen and related habitats.
Okanagana opacipennis
manzanita cicada
Okanagana opacipennis, commonly known as the manzanita cicada, is a small cicada species described by Davis in 1926. It belongs to the genus Okanagana, a group of annual cicadas found in western North America. The species has been documented in California and Baja California, with 19 observations recorded on iNaturalist.
Okanagana oregona
Western Tiger Beetle
Okanagana oregona is a species of cicada in the family Cicadidae, described by Davis in 1916. It is native to western North America, with records from British Columbia through California and eastward to Montana and Idaho. The species inhabits riparian and shoreline habitats, particularly sandy or muddy banks of lakes and rivers. Adults are active during spring and fall, with seasonal timing varying by elevation and latitude.
Okanagana orithya
Okanagana orithya is a species of annual cicada in the family Cicadidae. It is native to western North America and belongs to a genus of medium-sized cicadas characterized by their dark coloration and distinctive wing patterns. Like other Okanagana species, it produces audible calling songs for mate attraction. The species is part of a diverse western cicada fauna that contrasts with the periodical cicada broods of eastern North America.
Okanagana ornata
Orange-margined Cicada
Okanagana ornata is a western North American cicada species in the family Cicadidae, commonly known as the Orange-margined Cicada. Like other Okanagana species, it is an annual or "dog-day" cicada with a multi-year life cycle spent primarily underground as a nymph. The species is distinguished by its ornate coloration with orange marginal markings. It is one of approximately 65 cicada species found in California and is part of the diverse western cicada fauna that differs from the periodical cicadas of eastern North America.
Okanagana salicicola
Okanagana salicicola is a small North American cicada species described by Bliven in 1964. As a member of the genus Okanagana, it belongs to a group of annual cicadas found primarily in western North America. The specific epithet 'salicicola' suggests an association with willow (Salix) habitats. Like other Okanagana species, it is likely a habitat specialist with specific host plant relationships, though detailed ecological studies remain limited.
Okanagana schaefferi
A western North American cicada species described by Davis in 1915. Records indicate presence in arid and semi-arid regions of the southwestern United States including Arizona, Colorado, Nevada, New Mexico, and Utah. As a member of the genus Okanagana, it belongs to a group of annual cicadas rather than the periodical cicadas of eastern North America.
Okanagana sequoiae
Okanagana sequoiae is a species of annual cicada in the family Cicadidae, described by Bliven in 1964. It is native to the western United States, with confirmed records from California and Oregon. Like other members of the genus Okanagana, it is not a periodical cicada and does not exhibit the synchronized mass emergence characteristic of Magicicada species.
Okanagana tristis rubrobasalis
Okanagana tristis rubrobasalis is a subspecies of cicada in the family Cicadidae, described by Davis in 1926. It belongs to the diverse western North American genus Okanagana, which comprises numerous species and subspecies with restricted distributions. This subspecies is distinguished from the nominate form by coloration differences, particularly reddish markings at the base of the abdomen. It occurs in arid and semi-arid regions of the western United States.
Okanagana vandykei
Okanagana vandykei is a cicada species in the family Cicadidae, native to the western United States. It is one of approximately 65 cicada species found in California. The species was described by Van Duzee in 1915 and is named in honor of entomologist H.H. Van Dyke. Like other members of the genus Okanagana, it is an annual cicada rather than a periodical species.
Okanagana venusta
Okanagana venusta is a species of cicada in the family Cicadidae, described by Davis in 1935. It belongs to the genus Okanagana, which contains numerous species of annual cicadas found in western North America. The species is documented from the southwestern United States including Arizona, California, and Utah. Like other Okanagana species, it is presumed to have a typical cicada life cycle involving nymphal development underground and adult emergence, though specific details for this species remain poorly documented.
Okanagana villosa
Okanagana villosa is a species of annual cicada in the family Cicadidae, described by Davis in 1941. It is native to California and belongs to a genus of approximately 65 species found in western North America. Like other Okanagana species, it is not a periodical cicada and does not exhibit the synchronized mass emergences characteristic of Magicicada broods. The species name 'villosa' refers to hairy or shaggy appearance.
Okanagana vocalis
Okanagana vocalis is a cicada species in the family Cicadidae, described by Bliven in 1964. It belongs to the genus Okanagana, which comprises annual cicadas found in western North America. The species name "vocalis" suggests a notable acoustic characteristic, though specific call descriptions are not well documented. Like other Okanagana species, it is presumed to be an annual cicada rather than a periodical species.
Oligotylus
Oligotylus is a genus of plant bugs in the family Miridae, subfamily Phylinae, established by Van Duzee in 1916. Species in this genus are associated with coniferous host plants in western North America. The genus was revised by Schuh in 2000, who described ten new species and clarified its taxonomic boundaries relative to the related genus Lepidargyrus.
Oligotylus ceanothi
Oligotylus ceanothi is a species of plant bug in the family Miridae, described by Schuh in 2000. The species is associated with Ceanothus host plants, as indicated by its specific epithet. It occurs in western North America, with documented records from the southwestern United States and northwestern Mexico. Like other members of the genus Oligotylus, it is likely a phytophagous insect feeding on plant tissues.
Omalonomus relictus
Omalonomus relictus is a rove beetle species in the family Staphylinidae, described by Campbell and Peck in 1990. The species has been recorded from western Canada (Alberta, Saskatchewan) and the northwestern United States (Utah, Washington). As a member of the subfamily Omaliinae, it belongs to a group of rove beetles often associated with forest floor habitats and decaying organic matter.
Omus 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 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.