Wing-reduction

Guides

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
Ambositrinae
Ambositrinae is a subfamily of small parasitoid wasps within the family Diapriidae, established by Lubomir Masner in 1961. The group exhibits a predominantly Gondwanan distribution, with most extant species occurring in Australia, New Guinea, New Zealand, and South America. The subfamily has been documented from Eocene amber deposits in Europe, indicating a broader historical distribution. Taxonomic revision of Australian Ambositrinae has identified multiple genera and numerous species, with wing reduction being a notable morphological feature in some lineages.
parasitoid-wasp Diapriidae Gondwanan-distribution fossil-record Eocene wing-reduction Australian-fauna
Apterodryinus
Apterodryinus is a genus of dryinid wasps erected by R. Perkins in 1907. The genus is currently treated as a synonym of Gonatopus. It was established for species characterized by reduced or absent wings in females. Records indicate presence in Denmark, Norway, and Sweden.
synonym dryinidae gonatopus wing-reduction Scandinavia
Barytettix
spur-throated grasshoppers
Barytettix is a genus of spur-throated grasshoppers in the family Acrididae, comprising approximately nine described species. Members are found in western Mexico and the southwestern United States. At least one species, Barytettix psolus, is obligately flightless, lacking functional wings and associated flight musculature. The genus belongs to the tribe Conalcaeini within the subfamily Melanoplinae.
flightlessness wing-reduction neuroanatomy Mexican-fauna southwestern-US-fauna spur-throated-grasshopper Melanoplinae Conalcaeini
Calosoma tepidum
lukewarm beautiful black searcher
Calosoma tepidum is a large ground beetle in the family Carabidae, subfamily Carabinae, first described by LeConte in 1851. It belongs to the 'caterpillar hunter' group within the genus Calosoma, characterized by large size and predatory habits. The species is flightless despite possessing fully developed wings, a condition attributed to thoracic muscle reduction. It has been the subject of recent genomic research as part of a model system for studying wing evolution in insects.
flightless caterpillar-hunter genomic-model nocturnal western-North-America wing-reduction
Carventinae
Carventinae is a subfamily of flat bugs (Aradidae) comprising over 364 species across 118 genera. The group is predominantly tropical in distribution and exhibits a strong trend toward flightlessness, with only seven genera retaining large, functional wings. New Zealand hosts eight recognized genera, six of which are endemic to the region.
flightless tropical wing-reduction New-Zealand-endemism
Dactylolabis vestigipennis
Dactylolabis vestigipennis is a small crane fly species in the family Limoniidae, first described by Charles Paul Alexander in 1950. The species is known from limited observations in the southwestern United States. Like other limoniid crane flies, it belongs to a diverse family of delicate, long-legged flies often found in moist habitats.
crane-fly Limoniidae Nearctic wing-reduction Alexander-1950
Doryctinae
doryctine wasps
Doryctinae is a large, diverse subfamily of parasitoid wasps within Braconidae, comprising over 2000 species in 198 genera. Members range from 1 to 25 mm and exhibit remarkable morphological diversity, including many flightless or wingless species. The subfamily is characterized by distinctive structural features including a cyclostome mouth and spines on the foreleg tibia. Most species are idiobiont ectoparasitoids of wood-boring beetle larvae, though host associations vary considerably across the group.
parasitoid biocontrol wood-boring-insects cyclostome wing-reduction gall-former inquiline diverse poorly-known
Dyspteris abortivaria
Bad-wing Moth, the bad-wing
Dyspteris abortivaria, commonly known as the Bad-wing Moth, is a species of geometrid moth in the family Geometridae. The common name refers to its distinctive wing morphology, where the hindwings are notably reduced in size compared to the forewings. It is found throughout North America and is one of the more frequently observed geometrid moths, with over 6,000 documented observations.
Geometridae Larentiinae North-America wing-reduction nocturnal light-attracted
Ectrichodiinae
Millipede Assassin Bugs
Ectrichodiinae are a large subfamily of assassin bugs comprising more than 600 species in approximately 115 genera. They are specialized predators of millipedes, capable of circumventing the noxious chemical defenses of their prey. The subfamily exhibits notable diversity in coloration, with both cryptic and aposematic patterns, including bright metallic blue, red, or yellow and black combinations. Females frequently show wing reduction and extreme sexual dimorphism.
assassin-bugs millipede-predators aposematic-coloration nocturnal chemical-defense-circumvention sexual-dimorphism wing-reduction gregarious-feeding
Hormiinae
Hormiinae is a subfamily of Braconidae (Hymenoptera) comprising approximately 8 species in 4 genera and 2 tribes in Iran, with a cosmopolitan genus Hormius. Members include brachypterous and micropterous species with reduced wings. Some species are parasitoids of lepidopteran pupae.
Braconidae Hymenoptera parasitoid wing-reduction brachypterous micropterous Lepidoptera-parasitoid
Lampyrini
glowing fireflies, continuous-light fireflies
Lampyrini is a tribe of fireflies (subfamily Lampyrinae) containing the typical 'glowing' or 'continuous-light' fireflies of the Holarctic region. The tribe includes the type genus Lampyris and formerly recognized Pleotomini, which molecular evidence indicates is a specialized offshoot nested within Lampyrini. Some derived genera, including Paraphausis and Pyrocoelia, have secondarily lost bioluminescent organs and communicate using pheromones instead. The tribe occurs across the Holarctic and includes Andean-endemic lineages such as Pseudolychnuris and Alychnus.
fireflies bioluminescence Holarctic Andes páramo pollination pheromone-communication wing-reduction convergent-evolution molecular-phylogenetics
Micropezidae
stilt-legged flies
Micropezidae is a family of acalyptrate muscoid flies comprising approximately 500 species in 50 genera and five subfamilies. Commonly called stilt-legged flies, they are distinguished by extraordinarily elongated middle and hind legs, with markedly smaller fore legs. Adults range from 3–16 mm and exhibit remarkable mimicry of ants, wasps, and ichneumonid wasps. The family is most diverse in tropical and subtropical regions, particularly the Neotropics, and is absent from New Zealand and Macquarie Island. Larval biology remains poorly known, with development occurring in decaying vegetation, manure, fungi, and in some species, living plant roots.
stilt-legged-flies mimicry ant-mimicry wasp-mimicry ichneumonid-mimicry acalyptrate Diptera decomposers predators ginger-pest wing-reduction foreleg-waving Neotropical tropical-diversity Baltic-amber-fossils conservation Kerguelen-Islands Albany-pitcher-plant Badisis Mimegralla Micropeza Taeniaptera Grallipeza
Mycotrupes lethroides
Mycotrupes lethroides is a flightless species of earth-boring scarab beetle in the family Geotrupidae. It is endemic to the southeastern United States, with confirmed records from Florida and Georgia. The species is notable among Geotrupidae for its complete wing reduction and associated inability to fly.
flightless endemic southeastern-United-States wing-reduction
Oligositinae
Oligositinae is a subfamily of minute parasitoid wasps within the family Trichogrammatidae. Members are among the smallest known insects, with body lengths often under 0.5 mm. The subfamily was established by Viggiani in 1971, though with authorship dating to 1904. These wasps are characterized by reduced wing venation and simplified morphological features compared to other trichogrammatids. They are known primarily from preserved specimens, with limited biological data available.
parasitoid minute wing-reduction Chalcidoidea
Psyllipsocus
Psyllipsocus is a genus of cave-dwelling barklice comprising more than 50 described species. Members of this genus inhabit dark, humid microhabitats including caves, rock crevices, and similar subterranean environments. The genus was established by Selys-Longchamps in 1872 and represents one of the most species-rich genera within the family Psyllipsocidae.
cave-dwelling troglobitic barklice Psyllipsocidae subterranean Nearctic Neotropical decomposer humid-microhabitat wing-reduction
Silinae
soldier beetles
Silinae is a subfamily of soldier beetles (family Cantharidae) comprising approximately 6 genera and more than 180 described species. The subfamily includes the genera Silis, Polemius, Discodon, Plectonotum, Ditemnus, and Tytthonyx. Species occur across the Nearctic and Neotropical regions, with some lineages showing remarkable high-altitude adaptations including extreme brachelytry (shortened elytra) and wing reduction.
brachelytry high-altitude-adaptation wing-reduction sexual-dimorphism Andean-fauna Neotropical Nearctic
Stictomyia longicornis
Stictomyia longicornis is a small picture-winged fly in the family Ulidiidae. Adults measure approximately 4 millimeters in length and are found almost exclusively on prickly-pear cacti in the southwestern United States. The species has been reared from rotting cactus pads, indicating larval development in decaying cactus tissue. Adults are morphologically unusual among flies, with short wings plastered to the back and a beetle-like or true bug-like appearance.
Diptera Ulidiidae picture-winged-fly cactus-associated wing-reduction southwestern-US
Vollenhovia
Vollenhovia is a genus of myrmicine ants distributed primarily in the Australasian and Oriental regions, with notable diversity in India, Sri Lanka, and East Asia. The genus contains species exhibiting remarkable reproductive strategies, including clonal reproduction by males (androgenesis) and queen polymorphism in wing morphology. At least one species, Vollenhovia nipponica, has evolved workerless social parasitism (inquilinism) on congeneric hosts. The genus serves as an important model system for studying the evolution of unusual caste determination, sex determination systems, and reproductive isolation mechanisms.
androgenesis thelytokous-parthenogenesis queen-polymorphism Wolbachia inquilinism social-parasitism reproductive-isolation clonal-reproduction wing-reduction
Vollenhovia emeryi
Vollenhovia emeryi is a queen-polymorphic ant species notable for its unusual reproductive biology. The species produces two distinct queen morphs: long-winged (L) and short-winged (S) forms, which exhibit genetic differentiation and reproductive isolation. Both male and female sexuals are produced clonally, while workers arise sexually from fertilized eggs—a reversal of the typical Hymenopteran pattern. The long-winged morph shows complete association with Wolbachia infection, while short-winged morphs lack this bacterial endosymbiont.
queen-polymorphism clonal-reproduction thelytokous-parthenogenesis Wolbachia wing-reduction genetic-caste-determination reproductive-isolation