California
Guides
Podabrus brunnicollis poricollis
soldier beetle
Podabrus brunnicollis poricollis is a subspecies of soldier beetle in the family Cantharidae. Like other members of the genus Podabrus, it is an elongate beetle with soft, flexible wing covers. The species is found in California and contributes to biological control of aphids and other soft-bodied insects in gardens and agricultural settings.
Podabrus knobeli
soldier beetle
Podabrus knobeli is a species of soldier beetle in the family Cantharidae. It is native to North America and is one of approximately 160 soldier beetle species found in California. As a member of the genus Podabrus, it shares the characteristic elongated body form and aphid-feeding habits common to this group of beneficial garden insects.
Poecilotettix sanguineus
Red-lined Grasshopper
Poecilotettix sanguineus, commonly known as the red-lined grasshopper, is a species of spur-throated grasshopper in the family Acrididae. It is native to North America, with documented occurrences in Arizona and California. The species was described by Scudder in 1897 and belongs to the tribe Dactylotini within the subfamily Melanoplinae.
Pogonogenys proximalis
Pogonogenys proximalis is a moth in the family Crambidae, subfamily Odontiinae. It was described by Charles H. Fernald in 1894. The species is known from a small number of records in California and Nevada, and remains poorly documented.
Pogonomyrmex anzensis
Anza desert harvester ant
Pogonomyrmex anzensis, the Anza desert harvester ant, is a species of harvester ant endemic to the Anza-Borrego Desert State Park and surrounding areas in Southern California. Described by Cole in 1968, this species belongs to a genus known for seed-collecting behavior and potent defensive stings. Like other Pogonomyrmex species, it constructs conspicuous nest clearings and plays ecological roles in seed dispersal and soil modification. The species is poorly studied compared to more widespread congeners, with limited published information on its specific biology.
Pogonomyrmex tenuispinus
Pogonomyrmex tenuispinus is a species of harvester ant in the genus Pogonomyrmex. Like other members of this genus, it is a seed-collecting ant native to arid regions. The species was described by Auguste Forel in 1914. As a harvester ant, it likely participates in seed dispersal and ecosystem engineering through nest construction, though specific ecological studies for this species are limited.
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dominula
European Paper Wasp
Polistes dominula is a highly successful invasive social wasp native to Eurasia that has established populations across North America, South America, New Zealand, South Africa, and other regions. First detected in North America near Boston in 1978, it has become one of the most abundant wasps on the continent. The species builds small, exposed paper nests in protected locations and preys primarily on live insects, particularly caterpillars. Unlike yellowjackets, it does not scavenge for meat or sugar. Its rapid spread has been attributed to ecological flexibility, superior competitive ability, and tolerance of human-altered environments.
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californica
Polycesta californica is a species of metallic wood-boring beetle in the family Buprestidae, first described by LeConte in 1857. It belongs to the subgenus Tularensia within the genus Polycesta. The species is native to western North America, with records from California and surrounding regions. As a member of the jewel beetle family, it exhibits the characteristic metallic coloration typical of Buprestidae.
Polyergus mexicanus
Western Amazon Ant
Polyergus mexicanus is an obligate social parasite known as the Western Amazon Ant, widely distributed across western North America. This species is incapable of performing basic colony tasks including foraging, nest excavation, and brood care, and depends entirely on enslaved workers of Formica host species. The species performs dramatic, coordinated raids on Formica colonies to capture larvae and pupae, which are then integrated into the parasite colony. Recent genetic studies have revealed substantial population structure associated with different host species, suggesting incipient speciation into host-specific lineages.
Polyphylla barbata
Mount Hermon June Beetle
Polyphylla barbata is a federally endangered scarab beetle endemic to a single restricted locality in the Zayante sandhills of Santa Cruz County, California. The species occupies less than 1,500 acres of habitat, making it one of the most geographically limited beetles in North America. Adults are active in mid-summer, with males flying at dusk to locate flightless females using pheromone-detecting antennae. The species faces severe habitat loss from sand mining and development, with over 40% of its sandhills habitat already destroyed.
Proba californica
Proba californica is a species of plant bug in the family Miridae, first described by Knight in 1968. Originally placed in the genus Pinalitus as Pinalitus californicus, it was later transferred to Proba. The species is known from California, USA, and represents one of the documented members of this genus in North America. As with other mirid plant bugs, it is presumed to feed on plant tissues, though specific host associations remain undocumented.
Promyrmekiaphila clathrata
wafer-lid trapdoor spider
Promyrmekiaphila clathrata is a species of wafer-lid trapdoor spider in the family Euctenizidae, endemic to California. It constructs silk-lined burrows up to 30 cm deep in soil, covered with a wafer-like trapdoor made of silk and soil. The species exhibits deep genetic population structure across its range but is not divided into multiple species. It is one of three described species in the genus Promyrmekiaphila.
Proserpinus lucidus
Pacific green sphinx, bear sphinx
Proserpinus lucidus is a small sphinx moth native to the Pacific coast of North America. Adults are active in winter from December to April, during which they do not feed. The species exhibits unusual seasonal timing among North American sphinx moths, with adults emerging and mating during the coldest months. Larvae feed on specific evening primrose relatives in the genera Clarkia and Camissonia, and possess a distinctive "bullseye" spot in place of the typical horn found in most sphinx moth caterpillars.
Pselaptrichus similis
Pselaptrichus similis is a species of ant-loving beetle (myrmecophile) in the rove beetle family Staphylinidae. It was described by Schuster and Marsh in 1956. The species is found in North America, with distribution records from California, USA. Like other members of the Pselaphinae subfamily, it is associated with ant colonies.
Pseudacysta perseae
Avocado Lace Bug
Pseudacysta perseae is a lace bug in the family Tingidae, originally described by Heidemann in 1908. It is a significant foliar pest of avocado (Persea americana), causing characteristic damage to leaves. The species has undergone substantial range expansion from its original Caribbean distribution to include Mexico, the southern United States, and Central America. It has been introduced to California, where population genetic studies indicate at least two separate invasion events. The species passes through four nymphal instars and exhibits sexual dimorphism in antennal coloration, with adult males having a substantially darker fourth antennal segment.
Pseudopityophthorus pubipennis
western oak bark beetle
Pseudopityophthorus pubipennis, the western oak bark beetle, is a small bark beetle in the family Curculionidae. The species has been identified as a vector of Geosmithia pallida, the causal agent of foamy bark canker disease on coast live oak (Quercus agrifolia) in California. Previously considered a secondary agent, this native beetle is now associated with significant tree decline and mortality in urban landscapes across multiple California counties.
Pseudosermyle catalinae
Catalina walkingstick
Pseudosermyle catalinae, commonly known as the Catalina walkingstick, is a species of stick insect in the family Diapheromeridae. It was described by Rentz and Weissman in 1981. The species is endemic to Santa Catalina Island, California, making it a geographically restricted phasmid with limited known observations.
Psilepyris californicus
Psilepyris californicus is a species of parasitoid wasp in the family Encyrtidae (Hymenoptera: Chalcidoidea). The genus Psilepyris is a small group within the Encyrtidae, a family known for their role as biological control agents of scale insects and other hemipteran pests. The specific epithet 'californicus' indicates this species was described from California. Encyrtid wasps are typically minute, with most species under 5 mm in length, and are characterized by reduced wing venation and geniculate (elbowed) antennae. Like other members of its family, P. californicus likely functions as a parasitoid, though specific host associations remain undocumented in the provided sources.
Psilophryoidea
Psilophryoidea is a genus of parasitoid wasps in the family Encyrtidae, established by Compere in 1928. The genus is represented in the UCR Encyrtidae collection by at least one species, Psilophryoidea comesor, which appears in both pinned and slide-mounted specimens. Encyrtidae are minute wasps, typically under 5mm, that parasitize other insects, particularly scale insects and other Hemiptera. The UCR collection contains one of the largest Encyrtidae holdings in the world, with extensive slide preparations and host records.
Psorthaspis planata
Psorthaspis planata is a spider-hunting wasp in the family Pompilidae, native to western North America with highest observation frequency in California and Baja California. The species specializes in hunting trapdoor spiders, with the California trapdoor spider documented as prey. Sexual dimorphism in eye and ocellar structure has been described, with females showing eyes positioned remote from the head vertex and low ocelli placement.
Psychomastax
monkey grasshoppers
Psychomastax is a genus of monkey grasshoppers in the family Eumastacidae, first described by Rehn and Hebard in 1918. The genus contains at least four described species distributed in arid regions of the western United States, primarily California and Nevada. These grasshoppers are characterized by their distinctive morphology typical of Eumastacidae, which are known for their jumping ability and often colorful appearance. The genus name reflects their placement within the Psychomastacini tribe.
Psychomastax inyo
White Mountain Grasshopper
Psychomastax inyo, commonly known as the White Mountain Grasshopper, is a species of monkey grasshopper in the family Eumastacidae. It was described by Rehn and Grant in 1959. The species is found in North America, with distribution records from California. As a member of Eumastacidae, it belongs to a group commonly referred to as monkey grasshoppers, characterized by their distinctive morphology and behavior. Available information on this species is limited, with only three observations recorded in iNaturalist.
Ptenothrix californica
Ptenothrix californica is a species of globular springtail in the family Dicyrtomidae. It is native to the Pacific North American region, particularly California. The species was described by Christiansen and Bellinger in 1981. As a member of the Symphypleona, it possesses a rounded, globular body form characteristic of this order of Collembola. It is documented in museum collections and has been recorded in citizen science observations.
Pugettia
kelp crabs
Pugettia is a genus of marine kelp crabs in the family Epialtidae, distributed across the North Pacific from North America to East Asia. Species inhabit shallow subtidal zones, primarily associated with macroalgal habitats including kelp beds, Sargassum stands, and red algal turfs. Many species exhibit ontogenetic habitat shifts, with juveniles and smaller individuals occupying deeper algal turfs while larger adults migrate to shallower macroalgal beds. The genus includes approximately 25 extant species plus one fossil species, with several species serving as important subjects for studies of crab growth, reproduction, and habitat ecology.
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obtusanalis
White-fringed Pyrausta Moth and Allies
Pyrausta obtusanalis is a crambid moth described by Druce in 1899. It belongs to the genus Pyrausta, a diverse group of small moths commonly known as pyrausta moths or snout moths. The species has a documented distribution in Mexico (Jalapa), southern California, and Arizona. Beyond basic taxonomic and geographic information, little is documented about its biology.
Reichenbachia arthritica
ant-loving beetle
Reichenbachia arthritica is a species of ant-loving beetle in the family Staphylinidae, subfamily Pselaphinae. It was described by Brendel in 1894. The species is known from California in the western United States. As a member of the myrmecophilous genus Reichenbachia, it has been observed in association with ant colonies.
Reticopsis nubila
Reticopsis nubila is a leafhopper species in the family Cicadellidae, subfamily Eurymelinae, described by Van Duzee in 1890. The genus Reticopsis belongs to the tribe Macropsini, a group of leafhoppers characterized by their association with woody plants. Records indicate this species occurs in California. As with many Macropsini, adults likely feed on plant phloem sap using piercing-sucking mouthparts.
Retinia edemoidana
Retinia edemoidana is a small moth in the family Tortricidae, first described by Harrison G. Dyar in 1903. It belongs to the pine cone moth genus Retinia, whose larvae develop within conifer cones. The species is documented from western North America, where it associates with pine hosts.
Rhachocnemis
sand-treader crickets
Rhachocnemis is a genus of sand-treader crickets in the family Rhaphidophoridae. The genus was described by Caudell in 1916 and contains one described species, R. validus. These crickets are adapted to sandy desert environments, where they burrow through loose substrate. They are part of the diverse camel cricket lineage, though specialized for psammophilic (sand-dwelling) habitats.
Rhagoletis fausta
black cherry fruit fly, black-bodied cherry fruit fly
Rhagoletis fausta is a tephritid fruit fly native to North America, commonly known as the black cherry fruit fly. The species was first described in 1877 and later transferred to the genus Rhagoletis in 1899. It is a documented pest of cherry trees, with both cultivated and wild cherries recorded as hosts. Research in California has established its distribution patterns and seasonal phenology, and it serves as a host for the parasitoid wasp Diachasma muliebre.
Rhaphiomidas terminatus
flower-loving fly
Rhaphiomidas terminatus is a species of mydas fly endemic to California. It belongs to the family Mydidae, a group of large, predatory or nectar-feeding flies. The species is commonly known as the flower-loving fly, reflecting its association with flowers. It is among the least-documented members of a poorly studied family in North America.
Rhopalomyia californica
Coyote Brush Bud Gall Midge
Rhopalomyia californica is a gall-forming midge in the family Cecidomyiidae, commonly known as the coyote brush bud gall midge. The species induces galls on its host plant and has been studied in both natural and urban environments. Research indicates its distribution and gall formation success are influenced by plant quality, natural enemies, and interspecific competition.
Rhopalomyia ericameriae
Rosette Bud Gall Midge
Rhopalomyia ericameriae is a gall midge in the family Cecidomyiidae, commonly known as the Rosette Bud Gall Midge. The species induces distinctive gall formations on host plants. As a member of the genus Rhopalomyia, it belongs to one of the most diverse genera of gall midges, with many species specialized on Asteraceae hosts.
Rhyacionia pasadenana
Rhyacionia pasadenana is a species of tortricid moth in the tribe Eucosmini, described by Kearfott in 1907 from Pasadena, California. The species belongs to a genus whose larvae are predominantly associated with coniferous trees, though specific biological details for this species remain poorly documented. It is known from a limited number of observations, primarily in western North America.
Rhyncolus californicus
Rhyncolus californicus is a species of weevil in the family Curculionidae, first described by Wollaston in 1873. The species epithet 'californicus' indicates an association with California. As a member of the genus Rhyncolus, it belongs to a group of weevils whose members are typically associated with dead or decaying wood and fungal substrates. The species is provisionally accepted in taxonomic databases, indicating some uncertainty regarding its current taxonomic status or the need for further revisionary work.
Rhynocoris ventralis annulipes
Rhynocoris ventralis annulipes is a subspecies of assassin bug described by Van Duzee in 1914. It is currently considered a synonym of Rhynocoris ventralis. The taxon belongs to the family Reduviidae, a diverse group of predatory true bugs commonly known as assassin bugs. Members of this genus are recognized for their raptorial forelegs adapted for capturing prey.
Rumatha jacumba
Rumatha jacumba is a species of snout moth (family Pyralidae) described by Herbert H. Neunzig in 1997. It is known from desert regions of southwestern North America, specifically California and Nevada. The species epithet references Jacumba, California, a locality in the Colorado Desert where the species has been collected. Like other members of the genus Rumatha, it belongs to a group of small pyralid moths associated with arid habitats.
Saprinus vestitus
Saprinus vestitus is a species of clown beetle in the family Histeridae, described by John Lawrence LeConte in 1851. It is classified within the subfamily Saprininae and placed in the subgenus Xerosaprinus. The species is known from California, USA. Histerid beetles in this genus are typically small, predatory beetles associated with decomposing organic matter.
Sceptobius lativentris
Sceptobius lativentris is a species of rove beetle in the family Staphylinidae, first described by Fenyes in 1909. It belongs to the tribe Sceptobiini within the subfamily Aleocharinae. The species has been recorded from North America and Central America, with specific documentation from California, USA.
Schinia brunnea
A noctuid moth species described in 1913, restricted to desert regions of southern California. Adults fly from late summer to early fall. Very little is known about its biology beyond basic distribution and phenology.
Schinia buta
Schinia buta is a small noctuid moth endemic to the arid regions of southeast California and northwest Nevada. The species has a wingspan of approximately 28 mm. Its larvae are known to feed specifically on Brickellia californica, a member of the aster family. Like other members of the genus Schinia, adults likely rest on or near their host plant flowers.
Schinia coercita
Schinia coercita is a noctuid moth described by Grote in 1881. It is a member of the flower moth genus Schinia, which contains over 120 species in North America. The species has been documented in the southwestern United States, specifically Arizona and California. Like other Schinia species, adults are likely associated with host plant flowers for feeding and oviposition.
Scolops californicus
California Dictyopharid Planthopper
Scolops californicus is a planthopper species in the family Dictyopharidae, endemic to California. It belongs to a genus characterized by distinctive head morphology with an extended, often bizarrely modified frons. The species is part of the diverse planthopper fauna of western North America, with records primarily from California. As a member of Hemiptera, it possesses piercing-sucking mouthparts adapted for feeding on plant vascular tissues.
Scolops pallidus
Scolops pallidus is a species of planthopper in the family Dictyopharidae, first described by Uhler in 1900. It belongs to a genus of distinctive 'rhinoceros planthoppers' characterized by an elongated head projection resembling a snout or horn. The species is currently accepted as valid, though it was previously listed as a synonym in some sources. Like other Scolops species, it is native to North America and feeds on plant sap.
Scolops viridis
Green Dictyopharid Planthopper
Scolops viridis is a planthopper species in the family Dictyopharidae, first described by Ball in 1902. It belongs to the infraorder Fulgoromorpha, a group known for their distinctive head structures and jumping abilities. The species is recorded from the southwestern United States including Arizona, California, Colorado, New Mexico, and Texas. As a member of the Dictyopharidae, it shares family-level characteristics of having an elongated, often enlarged head structure.
Scymnus calaveras
Scymnus calaveras is a small lady beetle species in the family Coccinellidae, described by Thomas L. Casey in 1899. The species epithet refers to Calaveras County, California, suggesting a type locality in the Sierra Nevada foothills region. As a member of the genus Scymnus, it likely belongs to the subfamily Scymninae, a group of minute lady beetles often associated with scale insect prey. Published records indicate presence in western North America including British Columbia, Canada, and California, USA.
Serradigitus
Sawfinger Scorpions
Serradigitus is a genus of small scorpions in the family Vaejovidae, commonly known as sawfinger scorpions. The genus contains more than 25 described species distributed across arid regions of the southwestern United States and northwestern Mexico. These scorpions are lithophilous, inhabiting rocky crevices and stone habitats. The venom of Serradigitus gertschi has been characterized through transcriptomic and proteomic analysis, revealing a complex mixture of ion channel toxins, enzymes, and other bioactive peptides.
Shelfordella
Turkestan cockroach, red runner cockroach, rusty red cockroach
Shelfordella is a genus of cockroaches in the family Blattidae, with Shelfordella lateralis being the most widely documented species. The genus is native to regions from northern Africa through Central Asia. S. lateralis has become an established invasive species in North America since 1978, particularly in California and Texas, where it has displaced the oriental cockroach in many areas. The species is primarily outdoor-dwelling but occasionally enters structures through sewers and drains.
Sigmocheir
Sigmocheir is a genus of flat-backed millipedes in the family Xystodesmidae, endemic to the foothills of the Sierra Nevada mountains in California. The genus contains three species: S. maculifer, S. calaveras, and S. furcata. All species share a distinctive color pattern of three lemon yellow spots per segment. The genus was established by R.V. Chamberlin in 1951, with a complex taxonomic history involving synonymies that were not fully resolved until 1995.
Siro sonoma
Siro sonoma is a species of mite harvestman in the family Sironidae. It was originally described by Shear in 1980 and placed in the genus Siro. In 2022, the genus Arhesiro was erected to accommodate this species and Siro clousi, with S. sonoma becoming Arhesiro sonoma. As of 2023, taxonomic sources vary in their treatment, with some recognizing Arhesiro sonoma as the accepted name while others retain Siro sonoma. The species is known only from Sonoma County, California.