Nearctic
Guides
Araniella
Cucumber Spiders, Sixspotted Orbweaver
Araniella is a genus of small orb-weaver spiders in the family Araneidae, first described in 1942. The genus includes approximately 20 recognized species distributed across the Palearctic and Nearctic regions, with notable species including A. cucurbitina (cucumber green spider) and A. displicata (sixspotted orbweaver). Members are characterized by green coloration due to biliverdin pigments, small body size (4–8 mm), and distinctive abdominal spotting patterns. Several species have been described recently, including A. villanii (2020) named after mathematician Cédric Villani.
Arawana
Arawana is a genus of ladybirds (family Coccinellidae) established by Leng in 1908. It belongs to the subfamily Chilocorinae and tribe Chilocorini, a group known for often being scale-feeding specialists. The genus contains at least four described species distributed in the Americas, with Arawana arizonica being the type species. Species were historically described under other genera before being transferred to Arawana.
Archips rosana
Rose Tortrix, Rose Tortrix Moth, Rose Leaf Roller
Archips rosana, the rose tortrix moth, is a leafroller moth in the family Tortricidae distributed across the Palearctic and Nearctic realms. The species is a significant agricultural pest of apple orchards and other fruit crops, with larvae feeding within rolled leaves. Adults are active from May to August, with specific timing varying by location. The species is subject to substantial biological control by parasitoid wasps, with parasitisation rates reaching 24-40% in some populations.
Archipsocus floridanus
ancient barklouse
Archipsocus floridanus is a species of barklouse in the family Archipsocidae, first described by Mockford in 1953. It is one of several species in the genus Archipsocus, a group sometimes referred to as "ancient barklice" within the order Psocodea. The species has been recorded across a broad geographic range spanning North, Central, and South America. Like other members of its family, it is presumed to inhabit bark and lichen microhabitats, though specific ecological details remain poorly documented.
Archophileurus cribrosus
Archophileurus cribrosus is a species of rhinoceros beetle in the family Scarabaeidae, subfamily Dynastinae. It is native to the southwestern United States and northern Mexico. The species belongs to the tribe Phileurini, a group characterized by distinctive morphological features. It has been documented across multiple states and Mexican states, primarily in arid and semi-arid regions.
Archytas apicifer
Hornworm Tachinid Fly
Archytas apicifer is a medium to large tachinid fly (10-15 mm) native to the Nearctic region. Adults feed on flower nectar and serve as pollinators. The larvae are internal parasitoids of caterpillars, including economically significant pest species. The species was first described by Francis Walker in 1849 and is one of approximately 10,000 species in the family Tachinidae.
Arctocorisa sutilis
Arctocorisa sutilis is a species of water boatman in the family Corixidae, first described by Uhler in 1876. It belongs to a genus of aquatic true bugs found in freshwater habitats. The species is recorded from North America, particularly in the Nearctic region excluding Beringia. Like other corixids, it is an aquatic insect adapted to life in ponds, lakes, and slow-moving waters. Very limited published information exists on its specific biology.
Ardella
Ardella is a genus of scarab beetles in the family Scarabaeidae, subfamily Melolonthinae, established by Paulsen in 2021. It is the type genus of the tribe Ardellini, a recently recognized lineage within the scarab beetles. The genus is known from the Nearctic region. As a newly described genus, detailed biological information remains limited.
Ardistomis
Ardistomis is a genus of pedunculate ground beetles (Carabidae: Scaritinae) comprising more than 40 described species distributed across North, Central, and South America. Larval morphology supports classification of ardistomines (Ardistomis, Semiardistomis, and Aspidoglossa) as a subtribe (Ardistomina) within the tribe Clivinini. The genus includes species with documented range extensions, such as A. quixotei, which likely colonized Cuba from Mexico during the Quaternary Period.
Arganthomyza vittipennis
Arganthomyza vittipennis is a small fly species in the family Anthomyzidae, originally described by Walker in 1857. It is currently classified as a synonym of Ischnomyia albicosta based on GBIF taxonomy, though iNaturalist maintains it as a valid species under Arganthomyza. The genus Arganthomyza comprises minute flies associated with wetland and marsh habitats. This species has been documented in the Nearctic region with limited observational records.
Argia cuprea
Coppery Dancer
Argia cuprea, commonly known as the coppery dancer, is a species of narrow-winged damselfly in the family Coenagrionidae. The species is widely distributed across the Americas, occurring in Central America, North America, and South America. It was first described by Hagen in 1861. The IUCN lists this species as Least Concern with a stable population, last assessed in 2018.
Argiope blanda
Argiope blanda is an orb-weaving spider in the family Araneidae. The species occurs from the United States south to Costa Rica. Like other members of the genus Argiope, it constructs spiral orb webs, though specific details of its web architecture and biology remain poorly documented compared to better-studied congeners such as A. aurantia and A. trifasciata.
Argyra nigripes
Argyra nigripes is a species of long-legged fly in the family Dolichopodidae, described by Loew in 1864. Members of the genus Argyra are small to medium-sized flies characterized by their metallic coloration and elongated legs. The species name 'nigripes' refers to black legs. As with many dolichopodid flies, specific biological details for this species remain poorly documented in accessible literature.
Aristaria
Aristaria is a monotypic moth genus in the family Erebidae, subfamily Hypeninae. It contains a single species, Aristaria theroalis, known from the United States and Costa Rica. The genus was established by Guenée in 1854. Little is documented about the biology or ecology of this genus.
Aristotelia planitia
Aristotelia planitia is a small moth in the family Gelechiidae, described by Annette Frances Braun in 1925. It is known from a limited number of records in Utah, North America. The species belongs to a genus of "twirler moths" whose larvae typically specialize on particular host plants.
Arthroplea bipunctata
flatheaded mayfly
Arthroplea bipunctata is a species of flatheaded mayfly in the family Heptageniidae (sometimes historically placed in Arthropleidae). It is known from North America, with records from the Nearctic region. The species was described by McDunnough in 1924, originally as Cinygma bipunctata. Like other flatheaded mayflies, it belongs to a group adapted to clinging in fast-flowing waters.
Asciodes
Asciodes is a genus of snout moths (Crambidae: Spilomelinae) containing five described species. The genus was established by Guenée in 1854 with Asciodes gordialis as the type species. Species are distributed across the Americas from the southern United States through the Caribbean to South America. Larvae of at least some species feed on plants in the order Caryophyllales.
Ascra bifida
Ascra bifida is a stink bug species in the family Pentatomidae, originally described by Thomas Say in 1831 as Pentatoma bifida. The species has been reclassified from Edessa to Ascra based on phylogenetic studies. It occurs across the Americas from the Caribbean through North, Central, and South America. The species epithet 'bifida' refers to a bifid (cleft or forked) structure, likely a diagnostic morphological feature.
Aspilanta argentifera
Aspilanta argentifera is a minute moth in the family Heliozelidae, originally described by Annette Frances Braun in 1927 and transferred from Antispila to the new genus Aspilanta in 2020 based on molecular phylogenetics. The species is restricted to eastern North America and is a leaf miner whose larvae feed exclusively on plants in the family Myricaceae. Adults have distinctive silvery-white markings on dark brown forewings.
Aspilanta viticordifoliella
Aspilanta viticordifoliella is a small leafmining moth in the family Heliozelidae, originally described as Antispila viticordifoliella by Clemens in 1860 and transferred to the new genus Aspilanta in 2020 based on phylogenetic analysis. The species is characterized by reduced wing venation and distinctive silvery forewing markings without an apical spot. Its larvae are specialized leaf miners on Vitaceae host plants.
Aspilanta voraginella
Aspilanta voraginella is a small moth in the family Heliozelidae, originally described by Annette Frances Braun in 1927 and transferred from Antispila to the new genus Aspilanta based on reduced wing venation and phylogenetic evidence. Adults have a wingspan of 4.7–5.4 mm. The species is found in the southwestern United States, where its larvae are gregarious leaf miners on Vitis arizonica.
Asyndetus johnsoni
Asyndetus johnsoni is a species of long-legged fly in the family Dolichopodidae, described by Van Duzee in 1916. The genus Asyndetus is a large and diverse group within Dolichopodidae, though specific ecological and behavioral information for A. johnsoni remains poorly documented. No observations of this species have been recorded in iNaturalist, indicating it is either rare, cryptic, or undercollected.
Ataeniopsis
Ataeniopsis is a genus of aphodiine dung beetles established by Petrovitz in 1973. The genus comprises approximately 15 described species. As members of the subfamily Aphodiinae, these beetles are classified within the tribe Eupariini. The genus occurs in the Nearctic and Neotropical biogeographic regions.
Ataenius apicalis
A small scarab beetle in the dung beetle group Aphodiinae, described by Hinton in 1936. The species occurs across the southern United States and Mexico, with records from both Nearctic and Neotropical regions. Like other members of Ataenius, it is likely associated with decomposing organic matter, though specific ecological details remain poorly documented.
Ataenius fattigi
Ataenius fattigi is a species of aphodiine dung beetle in the family Scarabaeidae. It is found in North America, with records from the eastern and central United States. The species was described by Cartwright in 1948. Like other members of the genus Ataenius, it is associated with decomposing organic matter.
Ataenius gracilis
Slender Small Dung Beetle
Ataenius gracilis is a small aphodiine dung beetle in the family Scarabaeidae. It is native to the Americas but has been introduced to Europe and Oceania, including the Azores and Galápagos Islands. The species has been recorded from diverse habitats ranging from the Nearctic zone through the Neotropics.
Ataenius imbricatus
Ataenius imbricatus is a small aphodiine dung beetle in the family Scarabaeidae. First described by Melsheimer in 1845 (originally as Aphodius imbricatus), this species exhibits a broad geographic distribution spanning the Nearctic and Neotropical regions. It is one of numerous species in the diverse genus Ataenius, which comprises small scarab beetles often associated with decomposing organic matter.
Ataenius inquisitus
Ataenius inquisitus is a species of aphodiine dung beetle described by Horn in 1887. It belongs to a genus whose members are generally associated with decomposing organic matter and soil habitats. The species has been recorded from the southwestern United States and several Mexican states.
Ataenius oklahomensis
Ataenius oklahomensis is a small scarab beetle in the subfamily Aphodiinae, described by Brown in 1930. The species is endemic to the south-central United States, with records from Oklahoma, Texas, Arkansas, and Louisiana. Like other members of the genus Ataenius, it is likely associated with soil and decaying organic matter, though specific ecological details remain poorly documented. The species name reflects its type locality in Oklahoma.
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rld-heritage-sites-relevance-minimalRamsar-sites-relevance-minimalimportant-bird-areas-relevance-minimalimportant-plant-areas-relevance-minimalkey-biodiversity-areas-relevance-minimalprotected-areas-relevance-minimalconservation-areas-relevance-minimalnature-reserves-relevance-minimalwildlife-sanctuaries-relevance-minimalnational-parks-relevance-minimalstate-parks-relevance-possibleprovincial-parks-relevance-absentregional-parks-relevance-minimallocal-parks-relevance-minimalcommunity-conserved-areas-relevance-minimalindigenous-protected-areas-relevance-absentprivate-protected-areas-relevance-minimalconservation-easements-relevance-minimalland-trusts-relevance-minimalconservation-covenants-relevance-absentstewardship-agreements-relevance-minimalmanagement-agreements-relevance-minimalco-management-arrangements-relevance-minimaljoint-management-arrangements-relevance-absenttransboundary-conservation-relevance-absentpeace-parks-relevance-absentcorridors-relevance-minimalnetworks-relevance-minimalmosaics-relevance-minimal,Ataenius punctifrons
Ataenius punctifrons is a species of scarab beetle in the family Scarabaeidae, originally described by Cartwright in 1974. GBIF records indicate this name is currently treated as a synonym of Ataenius texanus. The species has been documented from the Nearctic and Neotropical regions, including multiple U.S. states and Mexican states as well as parts of Central America and the Caribbean.
Ataenius strigatus
Ataenius strigatus is a small aphodiine dung beetle in the family Scarabaeidae. The species was originally described by Thomas Say in 1823 as Aphodius strigatus. It occurs across much of North America and extends into Central America. Like other members of the genus, it is associated with decomposing organic matter.
Ataenius texanus
Ataenius texanus is a small aphodiine dung beetle in the family Scarabaeidae, described by Harold in 1874. It occurs across a broad geographic range spanning the southern United States, Mexico, Central America, and the Caribbean. The species is closely related to Ataenius hesperius, which has a more western distribution.
Atarba picticornis
Atarba picticornis is a limoniid crane fly whose larvae develop in decaying hardwood logs and stumps, where they feed on decomposing wood and associated fungi. The life cycle spans approximately one year, with adults emerging in spring to mate in swarms near larval habitat sites. This species functions as a decomposer in forest ecosystems and has been documented across eastern North America from Canada to the southern United States.
Ateuchus lecontei
Ateuchus lecontei is a dung beetle species in the family Scarabaeidae, described by Harold in 1868. The species is native to the Nearctic region, with records from the eastern and southeastern United States. It has been introduced to Hawaii and other Oceania locations. Very few documented observations exist, with only 14 records on iNaturalist.
Ateuchus texanus
Ateuchus texanus is a dung beetle species in the family Scarabaeidae, described by Robinson in 1948. It belongs to a genus known for dung-rolling and tunneling behaviors. The species occurs in parts of the southern United States and Mexico.
Athalia cornubiae
Stonecrop Tigress
Athalia cornubiae is a sawfly species described by Benson in 1931, commonly known as the Stonecrop Tigress. The species has been recorded in Europe (Belgium, Denmark) and North America (Canada, Ontario), suggesting either a natural transatlantic distribution or possible introduction. The common name implies an association with stonecrop plants (Crassula or Sedum), though specific host relationships require confirmation. As a member of the genus Athalia, it belongs to a group of sawflies whose larvae often feed on cruciferous or succulent plants.
Atheta prudhoensis
Atheta prudhoensis is a rove beetle species in the family Staphylinidae, described by Lohse in 1990. The species has been documented across northern North America, including extensive Canadian provinces and territories as well as parts of the northeastern United States. It was among the beetle species contributing to the substantial increase in documented fauna for New Brunswick, Canada, where beetle species counts rose from 1,365 in 1991 to 3,062 by 2016.
Atheta ventricosa
Distended Minute Rove Beetle
Atheta ventricosa is a small rove beetle species in the family Staphylinidae, described by Bernhauer in 1907. It is distributed across much of Canada and the northern United States. The species has been recorded from 10 Canadian provinces and territories and 12 US states.
Athous
click beetles
Athous is a genus of click beetles (family Elateridae) established by Eschscholtz in 1829. The genus has undergone significant taxonomic revision, with numerous Nearctic and Palearctic species transferred to other genera including Hemicrepidius, Harminius, and Acanthathous. Species occur across forested habitats in the Nearctic and Palearctic regions, with some species showing distinct habitat preferences for either broadleaved or coniferous woodlands. Larvae are predaceous or feed on dead invertebrates, and adults occasionally feed on plant material.
Athous orvus
Hairy-edged Click Beetle
Athous orvus is a click beetle described by Becker in 1974 from eastern North America. It is known from a broad range spanning Nova Scotia to Michigan to Virginia. The species is one of two new Athous species described in the 1974 revision of Nearctic species east of the Rocky Mountains. As a member of the Elateridae, it possesses the family's characteristic prosternal process that enables the clicking mechanism used for righting itself when overturned.
Athyrma ganglio
Athyrma ganglio is a species of owlet moth in the family Erebidae, distributed across North and South America. The species was described by Jacob Hübner in 1825. It is assigned to the subfamily Eulepidotinae, a group of generally medium-sized nocturnal moths. The MONA (Moths of North America) or Hodges number for this species is 8583.1.
Atomosia puella
Common Micropanther
Atomosia puella is a species of robber fly in the family Asilidae, commonly known as the Common Micropanther. Robber flies are predatory dipterans known for their aggressive hunting behavior and distinctive morphology adapted for capturing other insects in flight. The species was originally described by Wiedemann in 1828 under the basionym Laphria puella before being transferred to the genus Atomosia.
Atractotomus quercicola
Atractotomus quercicola is a species of plant bug in the family Miridae, described by Stonedahl in 1990. It is associated with oak trees (Quercus), as indicated by its specific epithet. The species is known from northeastern Mexico and Texas.
Atrecus macrocephalus
Atrecus macrocephalus is a rove beetle in the tribe Othiini, characterized by its relatively large head compared to body proportions. The species occurs across northern North America and has been recorded in both Canada and the western and northeastern United States. As a member of Staphylinidae, it belongs to one of the most diverse beetle families, though specific ecological details for this species remain limited in published literature.
Attenella soquele
Attenella soquele is a species of spiny crawler mayfly in the family Ephemerellidae. The species was described by Day in 1954 and is recognized as valid in current taxonomic databases. Members of the genus Attenella are characterized by their distinctive spiny abdominal tubercles and are primarily distributed in North America.
Attenuipyga platyrhyncha
Attenuipyga platyrhyncha is a leafhopper species in the family Cicadellidae, described by Osborn in 1894. It belongs to a small genus of Nearctic leafhoppers. The species has been documented in scattered localities across the central and western United States and Canada.
Aulogymnus
Aulogymnus is a genus of chalcidoid wasps in the family Eulophidae, first described by Förster in 1851. Members of this genus are small parasitoid wasps, part of a diverse family that primarily parasitizes other insects. The genus has been recorded from Europe and Asia. Specific biological details for the genus as a whole remain poorly documented in accessible literature.
parasitoidEulophidaeChalcidoideaHymenopteraPalearcticwaspsinsectsarthropodsentomologytaxonomyFörster-1851DenmarkSpainTibetChinaEuropeAsiaminute-waspschalcid-waspsEulophinaeTerebrantesApocritaHexapodaAnimaliaArthropodaInsectaAulogymnussmall-waspstiny-waspsparasitic-waspsbiological-controlinsect-parasitoidssystematicsmorphologyidentificationkeysNearcticOrientalXizangcitizen-scienceiNaturalistobservationsrecordsdistributionFörster1851genusacceptedvalidsynonymychalcidoidchalcidchalcidseulophideulophidseulophid-waspseulophinesparasitoid-waspsparasitic-Hymenopterabiological-control-agentsinsect-diversitybiodiversityfaunaentomologicalhymenopteranarthropodhexapodhexapodspterygotepterygotesendopterygoteendopterygotesholometabolousholometabolatiny-insectsminute-insectssmall-insectsmicrohymenopteramicro-waspsmicro-parasitoidsmicro-chalcidsmicro-eulophidswing-venationantennaethoraxdiagnostic-characterstaxonomic-keysidentification-keysgeneric-keysNearctic-faunaEuropean-faunaAsian-faunaTibetan-faunaSpanish-faunaDanish-faunapoorly-knowndata-deficientunderstudiedcryptic-diversityhost-unknownbiology-unknownlife-history-unknownecology-unknowndistribution-recordsoccurrence-recordsspecimen-recordsmuseum-recordsdatabase-recordsGBIFCatalogue-of-LifeNCBIWikipediaUniversal-Chalcidoidea-DatabaseKey-to-Nearctic-eulophid-generaliteraturesourcesreferencescitationsbibliographyoriginal-descriptiontype-speciestype-localitynomenclaturesystematic-entomologyhymenopterologychalcidologyparasitologybiological-control-researchintegrated-pest-managementIPMagricultural-entomologyforest-entomologymedical-entomologyveterinary-entomologyurban-entomologyconservation-entomologyinsect-ecologycommunity-ecologypopulation-ecologybehavioral-ecologyevolutionary-ecologyphylogeneticsphylogenymolecular-systematicsDNA-barcodingtaxonomy-and-phylogenyclassificationbiodiversity-informaticsbiogeographyhistorical-biogeographyphylogeographydispersalvicariancespeciationdiversificationevolutionadaptationnatural-selectionsexual-selectionlife-history-evolutionhost-parasitoid-interactionscoevolutiontritrophic-interactionsfood-websecosystem-servicesnatural-enemiesbiocontrolaugmentative-biological-controlclassical-biological-controlconservation-biological-controlinvasive-species-managementpest-managementsustainable-agricultureorganic-farmingagroecologyecosystem-healthenvironmental-monitoringbioindicatorsindicator-speciesclimate-changeglobal-changehabitat-lossfragmentationconservation-statusIUCNred-listnot-evaluatedresearch-needsknowledge-gapsfuture-researchprioritiesspecimen-collectionvoucheringmuseum-collectionsnatural-history-collectionsdigitizationdata-sharingopen-scienceFAIR-principlescitizen-science-contributionscommunity-sciencepublic-engagementscience-communicationeducationoutreachnatural-historyinsect-watchingwasp-watchingnature-observationbiodiversity-appreciationAuridius auratus
Auridius auratus is a Nearctic leafhopper species in the family Cicadellidae, originally described as Jassus auratus by Gillette & Baker in 1895. The species exhibits wing polymorphism, a trait documented across the genus Auridius. It is one of twelve recognized species in this genus, which is characterized by yellow to golden coloration reflected in many of its species epithets. The junior synonym Auridius gilvus was synonymized with A. auratus by Hamilton in 1998.
Auridius cosmeticus
Auridius cosmeticus is a Nearctic leafhopper species described by Hamilton in 1999 from Montana. It belongs to the genus Auridius, which comprises twelve known species characterized by wing polymorphism and specific host plant associations. The species was established during a comprehensive revision of the genus that included descriptions of eight new species and documentation of phenology patterns across the group.
Auridius safra
Auridius safra is a leafhopper species in the family Cicadellidae, described from the western United States in 1999. The species is characterized by yellow coloration and pronounced sexual dimorphism in both color and wing form. It inhabits shortgrass prairie ecosystems and exhibits wing polymorphism with both fully-winged (macropterous) and short-winged (brachypterous) individuals.