California
Guides
Gammarotettix bilobatus
arboreal camel cricket
Gammarotettix bilobatus, commonly known as the arboreal camel cricket, is a North American species in the family Rhaphidophoridae. It is restricted to California, where it inhabits trees and shrubs in coastal and foothill regions. Adults are active from February through June. The species exhibits distinctive arboreal habits and anti-predator behaviors.
Gelechia desiliens
Gelechia desiliens is a small moth in the family Gelechiidae, described by Meyrick in 1923. It is known from California, with a wingspan of 19–22 mm. The species exhibits distinctive forewing patterning with light brownish ground color, dark fuscous suffusion, and characteristic stigmata markings.
Geocoris atricolor
big-eyed bug
Geocoris atricolor is a species of big-eyed bug in the family Geocoridae, native to western North America. It is one of three Geocoris species studied in California for temperature effects on development and reproduction. Like other big-eyed bugs, it is a predatory insect with piercing-sucking mouthparts, feeding on small arthropod prey and contributing to biological control in agricultural systems.
Givira marga
Givira marga is a carpenter moth in the family Cossidae, first described by Barnes and McDunnough in 1910. The species occurs in the southwestern United States, specifically California and Arizona. Adults are active from late spring through summer, with a wingspan of approximately 30 mm. The species is characterized by gray forewings with fine black strigae forming bands, and smoky brown hindwings.
Glaucina baea
Glaucina baea is a species of geometrid moth in the subfamily Ennominae, described by Rindge in 1959. It belongs to a genus of small to medium-sized moths characterized by relatively plain, grayish or brownish forewings. The species is known from North America, though specific details about its biology remain poorly documented. It is one of approximately 20 described species in the genus Glaucina, most of which occur in western North America.
Glyphipterix californiae
Glyphipterix californiae is a species of sedge moth described by Walsingham in 1881. It belongs to the family Glyphipterigidae, a group of small moths commonly associated with sedges and other monocot plants. The species is endemic to California. Like other members of its genus, it likely has narrow, lanceolate wings and metallic coloration, though specific details remain poorly documented.
Gnophaela discreta
Gnophaela discreta is a moth in the family Erebidae, first described by Stretch in 1875. It occurs in the southwestern United States and Mexico. The species has a wingspan of approximately 38 mm. Its larvae feed on Mertensia species.
Gnorimoschema baccharisella
Coyote Brush Stem Gall Moth
Gnorimoschema baccharisella is a small moth in the family Gelechiidae, first described by August Busck in 1903. It is found in California, where its larvae induce hard stem galls on Baccharis pilularis (coyote brush). The species exhibits sexual dimorphism in forewing size, with females being slightly larger than males.
Gonocephalum sericeum
Gonocephalum sericeum is a small darkling beetle (Tenebrionidae) native to North Africa and the Middle East. It has been introduced to North America, where it has been established in California since at least 1980. The species is adventive (non-native and established) in North America and has been confused with Blapstinus dilatatus due to similar appearance.
Gosibius intermedius
Gosibius intermedius is a centipede species in the family Lithobiidae, first described by Chamberlin in 1917. It belongs to the order Lithobiomorpha, a group commonly known as stone centipedes or lithobiomorphs. The species has been recorded from California, USA, with 36 observations documented on iNaturalist. As with other lithobiid centipedes, it is likely a predatory soil-dwelling arthropod, though specific ecological details remain poorly documented.
Graphocephala atropunctata
blue-green sharpshooter
Graphocephala atropunctata, commonly known as the blue-green sharpshooter, is a xylem-feeding leafhopper native to the western United States. It is the principal native vector of Xylella fastidiosa, the bacterium that causes Pierce's disease in grapevines. This species has been extensively studied for its feeding behaviors using electropenetrography (EPG) techniques, which have characterized distinct waveform patterns associated with stylet penetration and xylem ingestion. Its role as a disease vector makes it economically significant to California's vineyard industry.
Grapholita edwardsiana
San Francisco Tree Lupine Moth
Grapholita edwardsiana, known as the San Francisco Tree Lupine Moth, is a species of tortricid moth in the family Tortricidae, subfamily Olethreutinae. The species was described by Kearfott in 1907 and is placed in the genus Grapholita, a diverse group of small moths commonly referred to as fruitworms or bud moths. Many Grapholita species are associated with leguminous plants, and the specific epithet "edwardsiana" suggests a possible association with lupines (Lupinus), particularly tree lupine. The species is part of the tribe Grapholitini, which includes numerous economically important pests of fruits and seeds.
Grotella tricolor
A small noctuid moth with a wingspan of 20–23 mm. Adults are active from August to September. The species was first described by William Barnes in 1904.
Gryllus alogus
Gryllus alogus is a species of field cricket described by Rehn in 1902. It is currently recognized as a synonym of Gryllus vocalis (Gryllus (Gryllus) vocalis). The species was originally described from specimens collected in California. As a member of the genus Gryllus, it shares the general characteristics of field crickets, including acoustic communication through stridulation.
Gryllus brevicaudus
Short-tailed Field Cricket
Gryllus brevicaudus, commonly known as the short-tailed field cricket, is a species of field cricket in the family Gryllidae. It was described by Weissman, Rentz, and Alexander in 1980. The species is found in North America, with distribution records from California. As a member of the genus Gryllus, it shares characteristics with other field crickets, though specific details distinguishing it from congeners are limited in available sources.
Gyponana elongata
Gyponana elongata is a leafhopper species in the family Cicadellidae, first described by Ball in 1935. As a member of the genus Gyponana, it produces brochosomes—hollow, soccer ball-shaped nanoparticles that coat its body surface. These brochosomes, measuring approximately 500 nanometers in diameter with angular, geometric surface pits, render the cuticle superhydrophobic and anti-reflective. The species is known from California, with minimal observational records.
Gyponana tenella
Gyponana tenella is a species of leafhopper in the family Cicadellidae. Leafhoppers in the genus Gyponana have been documented producing distinctive brochosomes—nanoparticles that create a water-repellent, anti-reflective coating on the exoskeleton. The species has been recorded in multiple U.S. states including California, Colorado, Florida, Georgia, and Illinois. As a member of the subfamily Iassinae, it belongs to a diverse group of plant-feeding insects typically associated with woody vegetation.
Habronattus californicus
Habronattus californicus is a species of jumping spider in the family Salticidae. It is native to western North America, occurring in California and the Baja California Peninsula in Mexico. Like other members of the genus Habronattus, males likely possess elaborate courtship displays involving visual and acoustic signals. The genus is known for having some of the most complex multimodal courtship behaviors among terrestrial invertebrates.
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plumasata
Hadena plumasata is a small noctuid moth endemic to the Sierra Nevada region of California. It was described in 1967 and named for Plumas County, where it occurs along the eastern slope of the range. The species is distinguished from congeners by its reduced wing pattern elements.
Hadoa montezuma
Aztec Sun-Singer
Hadoa montezuma is a cicada species in the family Cicadidae, commonly known as the Aztec Sun-Singer. It was originally described by Distant in 1881. The species belongs to the genus Hadoa, which was established to accommodate several North American cicada species previously placed in other genera. Distribution records indicate presence in Arizona, California, and Morelos, Mexico.
Hadrobregmus quadrulus
Hadrobregmus quadrulus is a small beetle species in the family Ptinidae, first described by LeConte in 1859 from specimens collected in California. It belongs to a group commonly known as death-watch and spider beetles, many of which are associated with wood or stored products. The species is documented from western North America, with records from British Columbia and California.
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.
Hadrurus anzaborrego
Anza-Borrego Hairy Scorpion
Hadrurus anzaborrego is a large scorpion endemic to the western Colorado Desert of southern California and extreme northern Baja California. It is a medium-sized member of the genus Hadrurus, reaching up to 11 cm in length. The species exhibits two distinct color phenotypes: light individuals are pale yellow, while dark individuals have a melanic posterior carapace and mesosoma. Both forms display a characteristic dark, v-shaped pattern near the eyes. The species name derives from Anza-Borrego Desert State Park, where the holotype was collected.
Haeterius californicus
clown beetle
Haeterius californicus is a species of clown beetle in the family Histeridae, first described by Horn in 1870. It is a member of the subfamily Haeteriinae, a group of histerid beetles commonly known as clown beetles. The species is found in North America, with confirmed records from California, USA. Like other members of its genus, it is likely associated with social insects, though specific ecological details remain poorly documented.
Haeterius wagneri
clown beetle
Haeterius wagneri is a species of clown beetle in the family Histeridae, described by Ross in 1938. It belongs to the subfamily Haeteriinae, a group commonly known as clown beetles. The species is known from North America, with records from California, USA.
Haeterius zelus
Haeterius zelus is a species of clown beetle in the family Histeridae. It was described by Fall in 1917. The species is known from North America, with records from California, USA. Like other members of the genus Haeterius, it is likely associated with social insects, though specific ecological details for this species remain poorly documented.
Halacritus maritimus
clown beetle
Halacritus maritimus is a species of clown beetle in the family Histeridae, first described by John Lawrence LeConte in 1851. The species is distributed in North America, with records from California and potentially other regions of the United States. As a member of the Histeridae, it belongs to a family of beetles commonly known as clown beetles or hister beetles, characterized by their compact bodies and clubbed antennae.
Hebardacris
Mount Whitney grasshopper (for H. albida)
Hebardacris is a genus of spur-throated grasshoppers in the family Acrididae, established by Rehn in 1952. The genus contains at least three described species: H. albida (Mount Whitney grasshopper), H. excelsa, and H. mono. These species are native to western North America, with records concentrated in California. The genus belongs to the tribe Podismini within the subfamily Melanoplinae.
Hebardacris albida
Mount Whitney grasshopper
Hebardacris albida, known as the Mount Whitney grasshopper, is a species of spur-throated grasshopper in the family Acrididae. The species was described by Hebard in 1920. It belongs to the subfamily Melanoplinae and tribe Podismini. The specific epithet "albida" refers to its whitish coloration.
Hebardacris mono
Hebardacris mono is a species of spur-throated grasshopper in the family Acrididae, described by Rehn in 1964. It is known from North America, with confirmed distribution records from California. As a member of the subfamily Melanoplinae and tribe Podismini, it belongs to a group of grasshoppers commonly associated with western North American habitats.
Heliolonche celeris
Heliolonche celeris is a noctuid moth described by Augustus Radcliffe Grote in 1873. It belongs to the subfamily Heliothinae within the owlet moth family Noctuidae. The species is endemic to California and comprises two recognized subspecies: the nominate H. c. celeris and H. c. melicleptrioides. Available records indicate it is rarely encountered, with few documented observations.
Heliothodes
Heliothodes is a small genus of owlet moths in the family Noctuidae, subfamily Heliothinae, containing two described species: H. diminutivus and H. joaquin. The genus was established by Hampson in 1908. At least one species, Heliothodes diminutiva, is a specialist herbivore of tarweed (Madia elegans) in California, where its caterpillars feed on developing flower buds and can completely sterilize host plants.
Hemileuca eglanterina shastaensis
Mount Shasta Sheep Moth
Hemileuca eglanterina shastaensis is a subspecies of sheep moth in the family Saturniidae, endemic to the Mount Shasta region of northern California. As a member of the Hemileuca genus, it is a day-flying moth with reduced mouthparts that does not feed as an adult. The subspecies exhibits the characteristic orange and black coloration typical of H. eglanterina, though with geographic variation associated with its isolated mountain habitat. Like other buck moths, its larvae possess urticating spines that can deliver painful stings.
Hesperoperla hoguei
Banded Stone
Hesperoperla hoguei is a species of stonefly in the family Perlidae, commonly known as the banded stone. It is a member of the subfamily Acroneuriinae, a group of predatory stoneflies often associated with flowing freshwater habitats. The species was described by Baumann and Stark in 1980 and is known from western North America, particularly California. As with other perlid stoneflies, it likely inhabits cool, well-oxygenated streams.
Hesperorhipis hyperbola
A small metallic wood-boring beetle in the tribe Xenorhipidini, distinguished by abbreviated elytra and pronounced sexual dimorphism in antennal structure. The species was described by Knull in 1938 and includes two recognized subspecies. Like other members of its tribe, males possess highly modified flabellate antennae while females retain unmodified serrate antennae.
Hesperorhipis mirabilis
Hesperorhipis mirabilis is a small metallic wood-boring beetle in the family Buprestidae, tribe Xenorhipidini. It is one of four species in the genus Hesperorhipis, which is restricted to Arizona and California. The species is characterized by highly abbreviated elytra, particularly in males, and belongs to a tribe notable for extreme sexual dimorphism in antennal structure. Two subspecies are recognized: H. m. mirabilis and H. m. albopennis.
Horribates
Horribates is a genus of camel spiders (order Solifugae) in the family Eremobatidae, containing three described species restricted to the southwestern United States. All known species occur in California, with one species also recorded from Nevada. The genus was established by Martin Hammond Muma in 1962, with the name reflecting the formidable appearance characteristic of solifugids.
Hydrochara rickseckeri
Ricksecker's Water Scavenger Beetle
Hydrochara rickseckeri is a rare, California-endemic water scavenger beetle in the family Hydrophilidae. It is one of the few Hydrochara species native to North America. The species was described by Horn in 1895 and remains poorly known due to its limited distribution and scarcity of observations.
Hydrophilus insularis
Hydrophilus insularis is a water scavenger beetle in the family Hydrophilidae. It is distributed across a broad geographic range from northern South America through the Caribbean, Central America, and Mexico into the southern United States. The species is aquatic and belongs to a genus known for scavenging behavior in freshwater habitats.
Hymenomima umbellularia
Hymenomima umbellularia is a species of geometrid moth in the family Geometridae. The species name references its association with California bay laurel (Umbellularia californica), indicating a specialized ecological relationship with this host plant. It is primarily known from western North America, particularly California. Adults are active during spring and early summer. The species has been documented through 191 iNaturalist observations, suggesting moderate but localized abundance within its range.
Hyperaspis annexa
Hyperaspis annexa is a small lady beetle (Coccinellidae) native to North America, with records from California. Adults measure 2.0–2.75 mm and are characterized by black elytra with two yellow vittae. Males have a yellow anterior pronotal margin, sometimes black. The species belongs to a genus whose larvae are notable predators of scale insects, though specific prey relationships for this species remain undocumented.
Hyperaspis cincta
Corona Sigil Lady Beetle
Hyperaspis cincta is a small lady beetle species in the family Coccinellidae, measuring approximately 2.0–2.6 mm in length. It is native to western North America, with confirmed records from California and Utah. Adults are distinguished from the similar Hyperaspis inflexa by their wider marginal vitta on the elytra. The genus Hyperaspis includes species known as predatory biocontrol agents of scale insects.
Hyperaspis osculans
Hyperaspis osculans is a small lady beetle in the family Coccinellidae. Adults measure 2.50–3.10 mm. The species is native to North America and has been recorded from California. Like other members of the genus Hyperaspis, it is a predator of scale insects. The larvae produce a white waxy coating that serves as camouflage and protection against predators.
Hypochilus bernardino
A rare spider species in the family Hypochilidae, described by Catley in 1994. The specific epithet "bernardino" references the San Bernardino Mountains of southern California, where the species was first discovered. Hypochilidae is a small family of spiders with distinctive morphological features and limited geographic distribution.
Hypsalonia merga
Hypsalonia merga is a species of spur-throated grasshopper in the family Acrididae. It was described by Gurney and Buxton in 1963. The species is known from California and is part of the North American grasshopper fauna.
Hypsalonia tioga
Hypsalonia tioga is a species of spur-throated grasshopper in the family Acrididae, first described by Gurney and Eades in 1961. The species is known from California and is part of the North American grasshopper fauna. It belongs to the genus Hypsalonia, which is placed within the tribe Podismini of the subfamily Melanoplinae.
Hypsoprora simplex
Hypsoprora simplex is a treehopper species in the family Membracidae, described by Van Duzee in 1923. It belongs to the tribe Hypsoprorini within the subfamily Membracinae. Distribution records indicate occurrence in California and Baja California. The genus Hypsoprora is characterized by distinctive pronotal morphology typical of this treehopper group.
Idiostatus fuscus
Dark Shieldback
Idiostatus fuscus is a shield-backed katydid in the family Tettigoniidae, described by Caudell in 1934. The species is endemic to North America, with confirmed records from California. As a member of the Platycleidini tribe, it belongs to a group of katydids characterized by their shield-like pronotal morphology. The common name "Dark Shieldback" refers to its coloration and the distinctive expanded pronotum that covers much of the thorax.
Idiostatus inyo
Inyo Shieldback
Idiostatus inyo is a species of shieldback katydid in the family Tettigoniidae, described by Rehn & Hebard in 1920. It is endemic to California and is associated with the Inyo Mountains region, from which its specific epithet derives. The species belongs to a genus of flightless, ground-dwelling katydids commonly known as shieldbacks due to their enlarged, shield-like pronotum that covers much of the thorax and wings. Like other Idiostatus species, it is adapted to arid and semi-arid mountain environments.
Inopus rubriceps
Sugarcane soldier fly, Australian soldier fly
Inopus rubriceps is a soldier fly (Stratiomyidae) native to subtropical eastern Australia, where it has a long evolutionary history in Southeast Queensland and northern New South Wales. The species has been introduced to New Zealand (first recorded 1944) and California, where it establishes in warm, moist climates. Larvae develop in soil around plant roots, with a life cycle typically spanning 24 months but occasionally completing in 12 months. The species is an agricultural pest of sugarcane, pasture, oats, and maize, though not considered major.