Brachyptery

Guides

Acentria ephemerella
Water Veneer, watermilfoil moth
Acentria ephemerella is an aquatic moth in the family Crambidae, notable as the only moth with females that remain fully aquatic throughout their entire adult lives. The species exhibits extreme sexual dimorphism: most females are brachypterous (short-winged and flightless) with swimming adaptations including additional hairs on their legs, while males have fully developed wings and live only 1-2 days solely for breeding. Native to Europe and now established in North America, this species has gained attention as a biological control agent for invasive aquatic plants, particularly Eurasian watermilfoil (Myriophyllum spicatum).
aquatic-moth biocontrol sexual-dimorphism brachyptery invasive-species-management freshwater-ecology
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
Brachypterolus
short-winged flower beetles
Brachypterolus is a genus of short-winged flower beetles in the family Kateretidae, containing approximately six described species. Members of this genus are associated with toadflax plants (Linaria spp.) and have been introduced to North America as inadvertent biological control agents for invasive toadflax species. The genus is characterized by reduced wing development, consistent with its name meaning "short-winged."
Kateretidae brachyptery seed-predator biological-control Linaria toadflax invasive-species-management aggregation-behavior
Chersodromia
dance flies
Chersodromia is a genus of dance flies in the family Hybotidae, comprising more than 70 described species. Species are distributed across multiple biogeographic regions including the Palaearctic, Nearctic, Afrotropical, and Oriental regions. Several species are associated with coastal and marine littoral habitats, particularly in Mediterranean and beach-dwelling environments. The genus includes both winged and brachypterous (short-winged) forms.
Hybotidae Drapetini coastal brachyptery Palaearctic dance-flies
Crambinae
Grass-veneers and Allies, snout moth grass borers, sod webworms
Crambinae is a large subfamily of Crambidae moths comprising over 1,800 species worldwide. Members are commonly known as snout moths, grass-veneers, or sod webworms. The subfamily is characterized by specialized morphological features including tympanal organs and a phallus attached medially to the juxta. Larvae are primarily root feeders or stem borers on grasses, with several species recognized as significant agricultural pests of maize, sugarcane, rice, and turfgrasses.
Lepidoptera Crambidae grass-moths agricultural-pests stem-borers root-feeders snout-moths sod-webworms brachyptery genitalia-identification
Diamesa
Winter Midges, Snow Midges
Diamesa is a genus of non-biting midges in the subfamily Diamesinae of the family Chironomidae. Adults are commonly known as winter midges or snow midges due to their unusual cold-season activity. The genus exhibits remarkable cold tolerance, with adults active at sub-zero temperatures and larvae inhabiting cold, running waters. Some species display wing dimorphism, with brachypterous (short-winged) forms adapted for ground mating on snow and ice, and macropterous (fully-winged) forms that swarm in flight during spring.
Chironomidae Diamesinae winter-activity cold-adaptation brachyptery wing-dimorphism glacial-streams snow-midges bioindicator mountain-insects arctic-alpine multivoltine crenal aquatic-insects
Dimorphopteryx abnormis
Dimorphopteryx abnormis is a species of sawfly in the family Tenthredinidae, subfamily Allantinae. The genus Dimorphopteryx is characterized by unusual wing dimorphism, with both fully winged and short-winged forms occurring within species. This species was described by Rohwer in 1911 and is known from multiple Canadian provinces. Like other tenthredinid sawflies, it is likely herbivorous with larvae feeding on plant foliage, though specific host plant associations remain poorly documented. The genus is taxonomically notable for its distinctive wing polymorphism, which is reflected in its name (Greek: dimorphos = two forms, pteryx = wing).
sawfly Tenthredinidae wing-dimorphism brachyptery Canada forest-insect Allantinae
Doratura
Doratura is a genus of leafhoppers (Hemiptera: Cicadellidae) in the tribe Chiasmini, distributed across the Palearctic and Nearctic realms. The genus contains 23 valid species following recent taxonomic revision, including four species described in 2021–2022. Species exhibit wing reduction polymorphism (brachyptery) as a dispersal strategy. The genus has been subject to detailed taxonomic study focusing on genital morphology, species group relationships, and distribution patterns.
leafhopper Cicadellidae Deltocephalinae Chiasmini Palearctic Nearctic brachyptery wing-polymorphism taxonomic-revision
Halticini
Halticini is a tribe of plant bugs within the family Miridae, subfamily Orthotylinae. The tribe has undergone generic reclassification based on phylogenetic analysis. Members are distributed globally, with notable diversity in Australia, the Caucasus Mountains, Central Asia, and the Middle East. Some genera exhibit striking morphological specializations, including myrmecomorphy and sexual dimorphism in antennae.
Miridae Orthotylinae Heteroptera plant-bugs myrmecomorphy brachyptery sexual-dimorphism Caucasus-endemic Australian-fauna montane-fauna
Hesperinus
Hesperinus is the sole genus in the relict family Hesperinidae, a small group of nematoceran flies in the infraorder Bibionomorpha. The genus contains approximately 8 extant species distributed primarily across the Palaearctic region, with single species in the Nearctic and Neotropical regions. Three fossil species have been described from Eocene Baltic amber. The family represents a phylogenetically isolated lineage with limited ecological and biological documentation.
relict-family sexual-dimorphism brachyptery Eocene-fossils Palaearctic stream-associated nematocera Bibionomorpha phylogenetically-isolated
Photinus tenuicinctus
thinly-girdled firefly, Ozark spark
Photinus tenuicinctus is a firefly species endemic to the Ozark Mountains of Arkansas and Oklahoma. Adults measure 8.5–11.5 mm in length. Males are fully winged and capable of flight, while females are brachypterous and flightless. The species exhibits sexual dimorphism in both morphology and bioluminescent signaling.
firefly bioluminescence sexual-dimorphism brachyptery endemic Ozarks Lampyridae Coleoptera cold-light nuptial-gift aggressive-mimicry Photuris light-pollution habitat-specialist
Satyrini
Alpines, Arctics, Nymphs, Satyrs, Graylings, Ringlets
Satyrini is the largest tribe in the subfamily Satyrinae, containing approximately 2,200 species of butterflies. The group includes well-known butterflies such as graylings, ringlets, and satyrs. Recent molecular phylogenetic studies have substantially revised the tribe's taxonomy, incorporating many genera formerly placed in the tribe Elymniini. The tribe's evolutionary history is closely tied to the diversification of grasses.
butterflies Lepidoptera Nymphalidae Satyrinae grass-feeding bamboo-feeding molecular-phylogenetics taxonomy-revision Andean-endemism paramo-adaptation brachyptery flightlessness convergent-evolution host-plant-evolution
Thioniini
Thioniini is a tribe of planthoppers within the family Issidae, established by Melichar in 1906. Members are small, often cryptically colored insects with reduced wings or brachypterous forms common in the group. The tribe is primarily distributed in the Palearctic region, with notable diversity in the Mediterranean basin and parts of Asia. Thioniini species are frequently associated with rocky or arid habitats and are known for their jumping locomotion typical of fulgoromorphans.
planthopper Issidae Palearctic Mediterranean brachyptery