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Allocapnia rickeri
Midwest Snowfly
Allocapnia rickeri is a small winter stonefly in the family Capniidae, commonly known as the Midwest Snowfly. It is one of numerous small, dark stoneflies in the genus Allocapnia that emerge during cold months when few other insects are active. The species has been documented across the central and eastern United States. Like other capniids, it is associated with clean, cold streams and is an important indicator of water quality.
winter-stonefly bioindicator coldwater Plecoptera Capniidae Allocapnia lotic emergence brachyptery aptery genitalia-identification Frison-1942 Midwest southeastern-US clean-water-indicator January-March small-stonefly wingless-female stream-insect shredder gatherer seasonal-resource water-quality aquatic-insect terrestrial-adult short-lived-adult oviposition submerged-eggs high-dissolved-oxygen low-temperature central-US eastern-US Alabama Arkansas Delaware Georgia Illinois hexapod hemimetabolous Euholognatha Nemouroidea Arctoperlaria Insecta Arthropoda Animalia GBIF Catalogue-of-Life iNaturalist NCBI taxonomy accepted-species 1942 Frison Ricker Midwest-Snowfly snowfly small-dark-stonefly clean-streams rivers well-oxygenated lotic-habitat cold-months winter-activity wing-reduction female-aptery male-flight epiproct paraproct terminalia taxonomic-revision congeners distribution-records observations 9-observations eukaryote metazoan arthropod insect stonefly winter-emerging January February March cold-weather near-freezing below-freezing water-surface submerged-substrates allochthonous-organic-material stream-ecosystems seasonal-food-resource insectivorous-birds predators scarce-prey unpolluted no-economic-importance stream-monitoring water-quality-indicator high-quality-coldwater microscopic-examination taxonomic-keys male-terminalia reliable-separation genitalic-examination overlapping-distribution similar-habitat small-size under-10-mm body-length reduced-wings absent-wings fully-developed-wings specific-identification published-descriptions illustrations subsequent-revisions characteristic family-Capniidae common-name extended-nymphal-period one-to-two-years short-lived does-not-feed aquatic-nymph clean-cold-streams low-temperatures year-round winter-months January-through-March family centered-Midwest extends-southeastern United-States documented appears most-reliably distinguished subtle-differences terminal-abdominal-structures should-be-compared against published subsequent genus-level characterized reduced absent females fully-developed males requires-examination male-genitalia structure paraprocts reliable separation overlaps similar many externally definitive relies microscopic examination comparison keys used biological indicator programs presence indicates cold conditions no-direct economic importance shredders gatherers processing allochthonous organic material stream ecosystems seasonal food resource insectivorous birds other when alternative prey scarce serves high-quality habitats development aquatic nymphal stages terrestrial adult stage nymphs develop streams extended period likely one two years based related species adults do-not feed active during weather air temperatures may near below freezing winged capable flight wingless short-winged remain water surface mating occur winter entering deposit eggs submerged substrates small commonly known numerous dark emerge few insects central eastern associated clean important under mm body length members genus wings possess fully developed specific identification level within requires male genitalia particularly most reliably subtle differences these terminal abdominal structures should compared descriptions taxonomic revisions winter-emerging maintain low high dissolved oxygen levels throughout year United States distribution centered extends southeastern months typically through this activity gives rise common name do not provides quality monitoring no direct habitat morphology size genitalic
Ephydrini
Ephydrini is a tribe of shore flies (Diptera: Ephydridae) comprising nine genera and 33 species in the Neotropical region. The tribe includes both temperate Northern Hemisphere genera (Setacera, Cirrula, Dimecoenia, Paracoenia, Ephydra) and exclusively Neotropical genera (Austrocoenia, Notiocoenia, Paraephydra, Neoephydra). Species-level identification relies heavily on male terminalia characters due to morphological similarity among species.
shore-flies Neotropical taxonomic-revision male-terminalia new-genera new-species
Gnoristinae
fungus gnats
Gnoristinae is a subfamily of fungus gnats within the family Mycetophilidae. As of 2019, over 442 species have been described across more than 30 genera, making it one of the most taxonomically challenging groups in Mycetophilidae with species and generic boundaries subject to frequent revision. The subfamily has been characterized as highly diverse with new taxa described annually from various parts of the world. Members are generally small flies, with some species reaching only 3 mm in body length.
fungus-gnats Mycetophilidae Diptera Holarctic boreal-forest old-growth-forest taxonomically-difficult male-terminalia DNA-barcoding
Hyadina
Hyadina is a genus of shore flies in the family Ephydridae, tribe Hyadinini. The New Zealand fauna is now restricted to a single species, H. breva, following taxonomic revision. The genus is distinguished by structures of the male terminalia, which are taxonomically diagnostic.
shore-flies Ephydridae Hyadinini New-Zealand-endemism male-terminalia taxonomy Diptera
Meoneura
Meoneura is a genus of small flies in the family Carnidae (Diptera). Species are found across multiple continents with records from Europe and Africa. The genus was established by Camillo Rondani in 1856. Male terminalia morphology has been used as a primary diagnostic feature for species identification.
Diptera Carnidae genus small-flies male-terminalia taxonomic-revision-needed
Scatophila
shore fly
Scatophila is a genus of shore flies (Diptera: Ephydridae) in the tribe Scatellini. The genus contains at least 26 Nearctic species, with additional species distributed across the Palearctic. Three new species were described from the Nearctic in 2021: S. angusta, S. bolwigi, and S. mystacina. Five species (S. contaminata, S. cribrata, S. iowana, S. mesogramma, and S. unicornis) have Holarctic distributions.
shore-fly coastal Holarctic male-terminalia Scatellini