Oregon
Guides
Acneus beeri
Beer's false water penny beetle
Acneus beeri is a species of aquatic beetle in the family Psephenidae, known from a single female specimen collected east of Cascadia, Oregon in July 1940. The species belongs to the false water penny beetles, a group characterized by their flattened, oval body form adapted for clinging to submerged surfaces in flowing water. No additional specimens have been reported in the more than 80 years since its original description, making it one of the most poorly known North American beetle species.
Anabrus cerciata
Big-tooth Anabrus, Big-tooth Mormon cricket
Anabrus cerciata is a shield-backed katydid in the family Tettigoniidae, described by Caudell in 1907. It belongs to the genus Anabrus, which also includes the well-known Mormon cricket (Anabrus simplex). The species is found in western North America, with confirmed records from Oregon and Washington. It is less studied than its congener A. simplex, and detailed biological information remains limited.
Anthocharis sara sara
Sara Orangetip, Pacific Orangetip
Anthocharis sara sara is the nominate subspecies of the Sara orangetip butterfly, ranging along the Pacific coast of North America. Adults display distinctive orange wing tips on otherwise white forewings, with green marbling on the ventral hindwings. The subspecies is associated with coastal and montane habitats where its host plants in the mustard family occur.
Anthocharis sara sempervirens
Sara Orange-Tip
Anthocharis sara sempervirens is a subspecies of the Sara Orange-Tip butterfly, first described in 2008. It belongs to the family Pieridae, which includes the whites and sulphurs. The subspecies epithet "sempervirens" (meaning "evergreen") references the coastal redwood (Sequoia sempervirens) forests with which this butterfly is associated. Like other orange-tips, males display distinctive orange coloration on the forewing tips.
Antrodiaetus lincolnianus
Lincoln's folding-door spider
Antrodiaetus lincolnianus is a species of folding-door spider in the family Antrodiaetidae, originally described as Brachybothrium lincolnianum by Worley in 1928. As a mygalomorph spider, it constructs a burrow sealed with a hinged, silken door that it uses for protection and ambush predation. The species is endemic to the United States. Like other members of the Antrodiaetus unicolor species complex, it has been subject to recent taxonomic revision using molecular methods due to cryptic morphological similarity with closely related species.
Apantesis edwardsii
A tiger moth in the family Erebidae, Apantesis edwardsii was described by Stretch in 1872. It has a highly restricted distribution, known only from the San Francisco area of California and Klamath County in Oregon. The species was transferred from the genus Grammia to Apantesis in a taxonomic revision that consolidated several related genera.
Athysanella expulsa
Athysanella expulsa is a species of leafhopper in the family Cicadellidae, described by Blocker in 1990. It belongs to the genus Athysanella, a group of small, slender leafhoppers distributed primarily in western North America. The species is known from limited collection records in Oregon. As with other members of its genus, it likely inhabits grassland or herbaceous vegetation, though specific ecological details remain undocumented.
Atrusca trimaculosa
Woollybear Gall Wasp
Atrusca trimaculosa, commonly known as the woollybear gall wasp, is a cynipid gall wasp that induces distinctive round, hairy galls on oak leaves. The galls are 3–4 mm wide, covered in stiff hairs, and typically clustered on leaf surfaces. Only females of this species are known, suggesting reproduction may occur through parthenogenesis. The species is associated with several oak species including valley oak, blue oak, and Oregon oak.
Attalus oregonensis
Attalus oregonensis is a species of soft-winged flower beetle (family Melyridae) in the order Coleoptera. The species epithet suggests an association with Oregon, though detailed geographic and ecological information is sparse. The genus Attalus comprises numerous species, many of which are found in western North America. Like other melyrids, members of this genus are typically associated with flowers and vegetation where they feed on pollen, nectar, and small arthropods.
Autographa speciosa
Autographa speciosa is a noctuid moth in the subfamily Plusiinae, known from a restricted range in western North America. The species was described by Ottolengui in 1902. Adults have a wingspan of approximately 38 mm and are active in midsummer. The limited geographic distribution and specific habitat associations make this a regionally significant species for Pacific Northwest and California lepidopteran fauna.
Booneacris alticola
Marys Peak Wingless Grasshopper
Booneacris alticola, commonly known as the Marys Peak Wingless Grasshopper, is a species of spur-throated grasshopper described in 1962. The specific epithet 'alticola' refers to its high-elevation habitat. It belongs to the subfamily Melanoplinae, a diverse group of North American grasshoppers. The species is characterized by its wingless condition, an adaptation common in montane grasshopper species.
Booneacris polita
Willamette wingless grasshopper
Booneacris polita, commonly known as the Willamette wingless grasshopper, is a flightless species of spur-throated grasshopper in the family Acrididae. It is endemic to the Pacific Northwest region of North America, with records primarily from Oregon. As its common name indicates, this species lacks functional wings, a trait that distinguishes it from most other grasshoppers and reflects its adaptation to stable, localized habitats.
Californiulus euphanus
Californiulus euphanus is a millipede species in the family Paeromopodidae, described by Chamberlin in 1938. It is endemic to the Pacific Northwest of the United States, specifically found in northwestern Oregon and southwestern Washington. As a member of the order Julida, it belongs to a group of cylindrical, burrowing millipedes.
Caloptilia nondeterminata
Caloptilia nondeterminata is a species of leaf-mining moth in the family Gracillariidae. It has been documented in Oregon and Washington in the Pacific Northwest of the United States. The larvae are known to feed on Ribes species, creating mines in the leaves of their host plants. Like other members of the genus Caloptilia, it likely undergoes the typical gracillariid life cycle involving an initial sap-feeding mine followed by a feeding stage where the larva rolls or ties leaves.
Capnia umpqua
Umpqua Snowfly
Capnia umpqua, commonly known as the Umpqua Snowfly, is a small winter stonefly species in the family Capniidae. It was described by Frison in 1942. The species occurs in western North America, with documented records from California and Oregon. As a member of the Capniidae, it belongs to a group of stoneflies adapted to cold-water environments and winter-emergence patterns.
Chlorochroa congrua
Chlorochroa congrua is a species of stink bug in the family Pentatomidae, described by Uhler in 1876. It belongs to the genus Chlorochroa, which includes several North American stink bug species. The species has been documented as prey for the predatory wasp Astata unicolor in Oregon, where it was observed being paralyzed and carried to the wasp's nest as provisions for its offspring. Beyond this predation record and basic taxonomic placement, detailed biological information about C. congrua remains limited in the available literature.
Chrysobothris eriogoni
Chrysobothris eriogoni is a metallic wood-boring beetle in the family Buprestidae, described by Westcott in 2005 from specimens collected in Oregon and Washington. As a member of the speciose genus Chrysobothris, it belongs to a group of jewel beetles known for their metallic coloration and association with woody plants. The species epithet 'eriogoni' suggests a potential association with Eriogonum (wild buckwheat), though this host relationship has not been explicitly documented in the available literature.
Cicindela amargosae
Great Basin tiger beetle
Cicindela amargosae, commonly known as the Great Basin tiger beetle, is a species of tiger beetle endemic to the Great Basin region of the western United States. It occurs in Oregon, Nevada, and California. The species contains two recognized subspecies: the nominate C. a. amargosae and C. a. nyensis. As with other tiger beetles, it is a predatory insect in the subfamily Cicindelinae, though specific behavioral and ecological details for this particular species remain poorly documented in the available literature.
Cinygma integrum
Cinygma integrum is a North American mayfly species in the family Heptageniidae. It is one of three Cinygma species on the continent. The life history has been studied in Oregon, where nymphs occupy submerged wood habitats year-round and adults emerge from mid-May to mid-July. The nymph is the only described member of its genus in North America.
Colon longitorsum
round fungus beetle
Colon longitorsum is a species of round fungus beetle in the family Leiodidae, first described by Peck & Stephan in 1996. It belongs to the genus Colon, a group of small beetles associated with fungal habitats. The species is known from limited records in western North America, specifically California and Oregon. As with other members of Leiodidae, it likely inhabits environments where fungal resources are available.
Conocephalus occidentalis
Pacific meadow katydid
Conocephalus occidentalis, the Pacific meadow katydid, is a species of meadow katydid in the family Tettigoniidae. It is found in western North America, with distribution records from California and Oregon. As a member of the genus Conocephalus, it is part of a group commonly known as meadow katydids.
Cryptomaster leviathan
Leviathan harvestman
Cryptomaster leviathan is a harvestman (opilionid arachnid) from southeastern Oregon, described in 1969. It is notable for its relatively large body size compared to other travunioid Laniatores, which inspired its name referencing the biblical Leviathan. The species was the sole member of its genus until the 2016 discovery of its congener C. behemoth. Populations show surprisingly low genetic divergence across an expanded range spanning multiple mountain ranges.
Ctenucha multifaria
White-margined Ctenucha Moth
Ctenucha multifaria is a tiger moth in the family Erebidae, occurring in California and western Oregon. It is one of several species in the widespread genus Ctenucha, which are frequently encountered on flowers during late summer and fall. Like other members of its genus, it exhibits wasp-mimicking coloration with metallic blue-black body and contrasting markings. The species was described by Francis Walker in 1854.
Cylindrocopturus eatoni
pine reproduction weevil
A weevil species in the family Curculionidae, commonly known as the pine reproduction weevil. Adults are black with dense grayish scales and are capable fliers, though they frequently hop when disturbed. The species is a documented pest of young ponderosa pine (Pinus ponderosa) and Jeffrey pine (P. jeffreyi), attacking reproductive structures and bark. It has been observed in Oregon and is associated with coniferous forest habitats.
Dermacentor occidentalis
Pacific Coast tick
Dermacentor occidentalis, commonly known as the Pacific Coast tick, is a hard tick in the family Ixodidae native to western North America. Unfed adults measure approximately 4.5 mm in length with a distinctive silvery-gray exoskeleton. This species is a known vector of several human pathogens including Rocky Mountain spotted fever, Pacific Coast tick fever, and tularemia, though it does not transmit Lyme disease. The tick exhibits a three-host life cycle, feeding on a wide range of mammalian, avian, and reptilian hosts throughout its development.
Diplotaxis subangulata
Diplotaxis subangulata is a small scarab beetle in the family Scarabaeidae, subfamily Melolonthinae, described by LeConte in 1856. The genus Diplotaxis comprises small chafers, and this species occurs across western North America from British Columbia to Baja California, with records throughout the southwestern United States. Adults have been observed congregating on low vegetation, apparently to intercept pheromone trails in search of mates. The species is attracted to lights at night.
Elaphrus americanus sylvanus
Elaphrus americanus sylvanus is a western subspecies of ground beetle in the family Carabidae, described by Goulet in 1982 from Oregon. The subspecies belongs to the Elaphrus americanus species complex, which was previously treated as a single species but later recognized as comprising multiple distinct taxa based on morphological analysis. Members of the genus Elaphrus are known for their strong resemblance to tiger beetles (Cicindelinae), often leading to misidentification by collectors.
Endasys oregonianus
Endasys oregonianus is a species of ichneumon wasp described by Luhman in 1990. The specific epithet "oregonianus" indicates a type locality or primary distribution in Oregon, USA. As a member of the large family Ichneumonidae, this species is presumed to be a parasitoid, though its specific host associations remain undocumented in available sources. The genus Endasys is part of the diverse ichneumonid fauna of North America.
Eutinobothris pilosellus
Eutinobothris pilosellus is a bat-associated cimicid bug formerly classified in the genus Cimex. Fossil remains from the Paisley Five Mile Point Caves in Oregon, dating to 5,100–11,000 years ago, represent the oldest known specimens of the genus Cimex/Eutinobothris. Unlike Cimex lectularius, this species has not been documented as a human parasite. The species remains extant and continues to parasitize bats in western North America.
Exapion ulicis
Gorse Seed Weevil
Exapion ulicis is a small seed-feeding weevil specialized on gorse (Ulex europaeus). Adults are light gray with a prominent snout roughly half the body length. The species is native to western Europe and has been introduced to New Zealand, California, Hawaii, and other regions as a biological control agent targeting invasive gorse populations. Larval feeding destroys seeds within pods, reducing plant spread, while adult feeding on stems and spines causes minor damage.
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rational-extensive-Pareto-optimal-individually-rational-Nash-stable-setminimal-weakly-retentive-Pareto-optimal-individually-rational-Nash-stable-setminimal-strongly-retentive-Pareto-optimal-individually-rational-Nash-stable-setminimal-collectively-retentive-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-retentive-Pareto-optimal-individually-rational-Nash-stable-setminimal-Nash-retentive-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-rational-retentive-Pareto-optimal-individually-rational-Nash-stable-setminimal-weakly-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-strongly-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-collectively-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-rational-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-weakly-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-strongly-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-collectively-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-Nash-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-rational-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-weakly-individually-rational-Pareto-optimal-individually-rational-Nash-stable-setminimal-strongly-individually-rational-Pareto-optimal-individually-rational-Nash-stable-setminimal-collectively-individually-rational-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-individually-rational-Pareto-optimal-individually-rational-Nash-stable-setminimal-Nash-individually-rational-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-rational-individually-rational-Pareto-optimal-individually-rational-Nash-stable-setFeron bakkeri
Pinched Leaf Gall Wasp
Feron bakkeri is a gall wasp in the family Cynipidae that induces distinctive pink leaf galls on oaks. The species was formerly classified under the genus Andricus and has been reclassified to Feron based on phylogenetic studies. It is considered relatively uncommon compared to other oak gall wasps in its range.
Fieberiella florii
privet leafhopper, Flor's leafhopper, cherry leafhopper
Fieberiella florii is a leafhopper species in the family Cicadellidae, native to Europe and established in North America. It is a phloem-feeding insect that develops on multiple woody host plants, particularly in stone fruit orchards and surrounding vegetation. The species has been experimentally confirmed as a vector of 'Candidatus Phytoplasma mali', the causal agent of apple proliferation disease. In western Oregon, it shows a distinct seasonal cycle with overwintering eggs, spring nymph emergence, and peak adult populations in summer.
Formica oregonensis
Oregon Field Ant
Formica oregonensis is a species of ant in the family Formicidae, first described by Cole in 1938. It belongs to the genus Formica, a large and ecologically diverse group of ants found primarily in the Northern Hemisphere. The species is known by the common name Oregon Field Ant. As a member of Formicinae, it lacks a stinger and instead uses formic acid for defense. Beyond basic taxonomic information, specific biological details about this species remain poorly documented in the scientific literature.
Grylloblatta chintimini
Marys Peak Ice Cricket, rock crawler
Grylloblatta chintimini is a species of rock crawler (family Grylloblattidae) described in 2015 from Marys Peak in the Oregon Coast Range. It is one of the most recently described species in this relict insect order, bringing the total number of Grylloblatta species to 15. The species occurs in a restricted alpine habitat on persistent snowpack near the 1250 m summit. Like other grylloblattids, it is adapted to cold, moist environments and is considered a living fossil representing one of the most basal lineages of winged insects.
Hadronema incognitum
Hadronema incognitum is a species of plant bug in the family Miridae, described by Forero in 2008. The species epithet "incognitum" (meaning unknown or unrecognized) likely reflects its prior confusion with congeners or its cryptic nature. As a member of the diverse Miridae family, it belongs to one of the largest families of true bugs. The species is known from a limited number of specimens in the Pacific Northwest and California.
Leiodes horni
Leiodes horni is a species of round fungus beetle in the family Leiodidae. It is found in western North America, specifically in California and Oregon. The species was described by Hatch in 1929. Like other members of the genus Leiodes, it is associated with fungal habitats.
Limonia triphaea
Limonia triphaea is a species of crane fly in the family Limoniidae, described by Charles Paul Alexander in 1954. It is currently recognized as a synonym of Metalimnobia triphaea. The species is known from a single locality in Oregon, USA. Very little information is available about its biology or ecology.
Lystridea uhleri
Lystridea uhleri is a species of leafhopper in the family Cicadellidae, subfamily Errhomeninae. Originally described as Bathysmatophorus uhleri by Baker in 1898, it was later transferred to the genus Lystridea. The species is native to western North America and has been recorded from California, Oregon, and Washington. Members of the genus Lystridea are generally associated with coniferous and deciduous forest habitats.
Macrosteles oregonensis
Macrosteles oregonensis is a leafhopper species in the family Cicadellidae, described by Kwon & Kwon in 2022. The species is known from Oregon. As a member of the genus Macrosteles, it belongs to a group of small, slender leafhoppers that are commonly associated with grasses and sedges. The species was recently described and detailed biological information remains limited.
Megarafonus lentus
Megarafonus lentus is a species of rove beetle in the family Staphylinidae. It is found in North America, with records from Oregon, USA. The species is classified as an 'ant-loving beetle,' indicating a probable association with ant colonies.
Melanoplus digitifer
Long-toed Grasshopper
Melanoplus digitifer is a species of spur-throated grasshopper in the family Acrididae, described by Hebard in 1936. It belongs to the large and diverse genus Melanoplus, which contains many economically important grasshopper species in North America. The species is known from the Pacific Northwest region of the United States.
Melanoplus immunis
immunis spur-throat grasshopper
Melanoplus immunis is a species of spur-throated grasshopper in the family Acrididae, described by Scudder in 1899. It belongs to the large genus Melanoplus, which contains many North American grasshopper species. The species is recorded from Oregon and is part of the broader North American fauna of short-horned grasshoppers.
Melanoplus oreophilus
Mount Hood Short-wing Grasshopper
Melanoplus oreophilus is a spur-throated grasshopper species endemic to the Mount Hood region of Oregon. The species is characterized by reduced wing development, a trait reflected in its common name. It inhabits high-elevation alpine environments and has a restricted geographic range.
Micropeplus neotomae
Micropeplus neotomae is a species of rove beetle in the subfamily Micropeplinae, described by Campbell in 1968. The species epithet 'neotomae' suggests an association with the rodent genus Neotoma (woodrats/packrats). It is known from California and Oregon in the western United States. As a member of the Staphylinidae, it possesses the characteristic short elytra that expose most of the abdomen.
Nedra stewarti
Nedra stewarti is a moth in the family Noctuidae, first described by Grote in 1875. It is found in California and Oregon. The species belongs to the genus Nedra, which is part of the subfamily Noctuinae. Limited information is available regarding its biology, ecology, and specific habitat requirements.
Nemeris
Nemeris is a genus of moths in the family Geometridae, established by Rindge in 1981. The genus contains three described species: N. speciosa, N. percne, and N. sternitzkyi. It is classified within the subfamily Ennominae, one of the largest subfamilies of geometer moths. The genus appears to have limited documentation, with only 30 observations recorded on iNaturalist.
Nephrotoma altissima
Nephrotoma altissima is a species of large crane fly in the family Tipulidae. It occurs across northern and western North America, ranging from Alaska and northern Canada south to Oregon, Arizona, and New Mexico. As a member of the genus Nephrotoma, it belongs to a group commonly known as tiger crane flies, which are distinguished by patterned wings and bodies.
Omalorphanus aenigma
Omalorphanus aenigma is a species of rove beetle in the family Staphylinidae, described by Campbell and Chandler in 1987. It belongs to the subfamily Omaliinae and tribe Anthophagini. The species is known from the Pacific Northwest region of the United States, with records from Oregon.
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-ColumbiaOregonCaliforniaWashingtonPhaneroptera nana
Mediterranean katydid, southern sickle bush-cricket
Phaneroptera nana is a small katydid native to mainland Europe, the Near East, and North Africa. It has established invasive populations in California (first recorded 1952), Oregon (since 2015), and South America, likely spreading via shipping. The species inhabits sunny, dry environments with shrubs and low tree branches. Adults are active primarily in summer and fall.