Baetidae
Guides
Acentrella
small minnow mayflies
Acentrella is a genus of small minnow mayflies in the family Baetidae. The genus contains at least 26 species distributed across Europe, North America, Asia, and Africa. Nymphs of at least some species inhabit cool, clean, swift rocky streams. Adult stages of several species remain undescribed due to the difficulty of rearing nymphs to maturity.
Acentrella feropagus
Acentrella feropagus is a small mayfly species in the family Baetidae, described in 2000 from North American material. It belongs to a genus of minute, delicate mayflies commonly known as small minnow mayflies. The species is known from limited collection records in the Nearctic region.
Acentrella insignificans
Acentrella insignificans is a species of small minnow mayfly in the family Baetidae. It was originally described as Baetis insignificans by McDunnough in 1926. The species has a broad distribution across North America and Central America, with records extending from Alaska and northern Canada through the southwestern United States and into Mexico.
Acentrella nadineae
small minnow mayfly
Acentrella nadineae is a small minnow mayfly in the family Baetidae. The species was described in 2009 and remained known only from nymphs until successful rearing produced the first documented adults. It inhabits cool, clean, swift rocky streams across parts of the eastern and midwestern United States. Near final instar nymphs exhibit unusual madicolous behavior, living in thin water films on rock surfaces.
Acentrella turbida
Acentrella turbida is a small minnow mayfly in the family Baetidae, first described by McDunnough in 1924. It is one of the most widespread mayfly species in North America, occurring across the continent from Alaska and Canada through the continental United States to northern Mexico, with additional populations in Central America. The species was originally described under the genus Pseudocloeon before being transferred to Acentrella. It belongs to a diverse genus containing numerous small, delicate mayfly species often difficult to distinguish without close examination.
Acerpenna macdunnoughi
small minnow mayfly
Acerpenna macdunnoughi is a species of small minnow mayfly in the family Baetidae. Originally described as Baetis macdunnoughi by Ide in 1937, it was later transferred to the genus Acerpenna. The species is found in North America.
Anafroptilum
Anafroptilum is a genus of small mayflies in the family Baetidae. The genus was first described from the East Palaearctic and Nearctic regions, with a single species A. kazlauskasi known from the former and eight species from the latter. In 2016, two new species were described from Thailand, marking the first report of the genus from the Oriental Region. Species in this genus are characterized by the absence of hind wings in adults and distinctive larval morphological features.
Anafroptilum conturbatum
Anafroptilum conturbatum is a species of small mayfly in the family Baetidae. As a member of this diverse family, it inhabits freshwater environments where it contributes to aquatic food webs. The species was described by McCafferty and Waltz in 1995. Like other baetid mayflies, it likely has a short adult lifespan focused primarily on reproduction.
Anafroptilum minor
Anafroptilum minor is a species of small minnow mayfly in the family Baetidae. Like other members of this family, it is characterized by reduced wing venation and relatively simple morphology compared to other mayfly families. The genus Anafroptilum contains species that are typically associated with running water habitats. Specific ecological details for A. minor are limited in available literature.
Baetis alius
small minnow mayfly
Baetis alius is a species of small minnow mayfly in the family Baetidae. It is found in the northwestern United States. As a member of the Baetis genus, it belongs to a diverse group of mayflies commonly known as blue-winged olives, though specific common names for this species are not well established.
Baetis bicaudatus
small minnow mayfly
Baetis bicaudatus is a small minnow mayfly in the family Baetidae, described by Dodds in 1923. It inhabits streams across western North America from Alaska to the southwestern United States and northern Canada. The species is bivoltine, producing two generations annually, with distinct summer and winter generations that differ in size and susceptibility to parasitism. Adults exhibit characteristic mayfly behavior including swarming mating aggregations, while nymphs are important grazers on periphyton in stream ecosystems.
Baetis notos
Baetis notos is a species of small minnow mayfly in the family Baetidae. It is found in Central America and North America, with its North American range extending across southern Mexico, the southern United States, and the northwestern United States. The species was described by Allen and Murvosh in 1987.
Baetis piscatoris
Baetis piscatoris is a species of mayfly in the family Baetidae, first described by Jay Traver in 1935. The species is known from the Nearctic region, with records from North America. As a member of the genus Baetis, it belongs to a diverse group of small to medium-sized mayflies commonly referred to as 'blue-winged olives' in angling contexts.
Callibaetis
Speckled Duns
Callibaetis is a genus of small minnow mayflies in the family Baetidae, comprising at least 30 described species distributed across North and South America. The genus has been taxonomically problematic, with recent phylogenetic work confirming its monophyly and establishing four subgenera. Species occupy diverse lentic habitats including ponds, lakes, and wetlands, with some populations adapted to variable salinity conditions.
Callibaetis californicus
small minnow mayfly
Callibaetis californicus is a small minnow mayfly in the family Baetidae, first described by Banks in 1900. The species occurs across Central America and western North America, including all of Mexico and the western United States. As a member of the Baetidae, it belongs to one of the most diverse families of mayflies, commonly known as small minnow mayflies for their streamlined, fish-like nymphal form.
Callibaetis ferrugineus ferrugineus
Callibaetis ferrugineus ferrugineus is a subspecies of small minnow mayfly in the family Baetidae. As a member of the genus Callibaetis, it belongs to a group of mayflies commonly known as pond mayflies or speckled mayflies. The subspecies is distributed in the Nearctic region, with records from North America including Vermont in the United States. Like other Baetidae, it has a relatively short adult lifespan focused on reproduction.
Callibaetis ferrugineus hageni
Callibaetis ferrugineus hageni is a subspecies of mayfly in the family Baetidae. The genus Callibaetis comprises small minnow mayflies found in aquatic habitats across North America. As with other mayflies in this genus, this subspecies has a multi-stage life cycle involving aquatic nymphs and short-lived winged adults. The subspecific epithet honors Hermann Hagen, a prominent 19th-century entomologist.
Callibaetis floridanus
small minnow mayfly
Callibaetis floridanus is a small minnow mayfly (Ephemeroptera: Baetidae) native to North and Central America. The species inhabits diverse aquatic environments including coastal ponds subject to saltwater intrusion and temporary wetlands (playas) in arid regions. Research demonstrates significant physiological plasticity in ion regulation, with populations capable of acclimating to salinities ranging from 113 to 9,921 µS/cm. Naiad development averages approximately 24 days from egg hatch to adulthood.
Callibaetis pallidus
small minnow mayfly
Callibaetis pallidus is a species of small minnow mayfly in the family Baetidae, first described by Banks in 1900. Like other members of the genus Callibaetis, it belongs to a group of mayflies commonly referred to as "small minnow mayflies" due to their streamlined bodies and swimming nymphal behavior. The species is documented from North America, though specific details about its ecology and distribution within this range remain limited in available literature.
Callibaetis pictus
Speckled Dun
Callibaetis pictus is a small minnow mayfly in the family Baetidae, commonly known as the Speckled Dun. It is distributed across Central America and North America, including all of Mexico and the northern and southwestern United States. Like other mayflies, it has an aquatic nymphal stage lasting months to years, followed by a brief adult lifespan measured in hours to days. The species is part of the EPT index (Ephemeroptera, Plecoptera, Trichoptera) used to assess water quality in environmental monitoring.
Callibaetis pretiosus
small minnow mayfly
Callibaetis pretiosus is a small minnow mayfly in the family Baetidae. The species was described by Banks in 1914 and is native to North America. Larvae have been documented in wet-weather pools, with records from the southeastern United States and a northward range extension to Pennsylvania. As a member of Ephemeroptera, it undergoes aquatic nymphal development followed by a brief terrestrial adult stage.
Camelobaetidius
minnow mayflies
Camelobaetidius is a genus of small minnow mayflies in the family Baetidae, comprising at least 40 described species distributed across the Nearctic and Neotropical regions. The genus is one of the most studied within Baetidae, with nymphs commonly inhabiting lotic (flowing water) environments. Species are distinguished by specific morphological characters, particularly the spatulate (flattened, spoon-shaped) tarsal claws present in nymphs. The genus exhibits considerable diversity in Central and North America, with additional species described from Costa Rica and southeastern Brazil.
Cloeon
Double-gilled Pond Creepers
Cloeon is a cosmopolitan genus of mayflies in the family Baetidae, commonly known as Double-gilled Pond Creepers. Species in this genus are aquatic as larvae (naiads) and inhabit diverse freshwater environments. At least one species, C. dipterum, is known to give birth to live naiads rather than laying eggs externally. The genus has been studied for its tolerance to environmental stressors including temperature and oxygen fluctuations.
Diphetor
Diphetor is a genus of small mayflies in the family Baetidae, established by Waltz and McCafferty in 1987. These insects belong to the order Ephemeroptera, characterized by their short adult lifespan and aquatic nymphal stages. The genus is part of the diverse Baetidae family, one of the largest families of mayflies.
Diphetor hageni
Hagen's Small Minnow Mayfly
Diphetor hageni is a small mayfly species in the family Baetidae, commonly known as Hagen's Small Minnow Mayfly. It is native to the Nearctic region, primarily distributed across North America. The species is part of the diverse Baetidae family, which are among the most abundant and widespread mayflies in running waters.
Fallceon quilleri
Fallceon quilleri is a small minnow mayfly in the family Baetidae, described by Dodds in 1923. It is known from a relatively small number of observations (15 records on iNaturalist). The species has a broad transcontinental distribution spanning temperate and tropical regions of the Americas.
Heterocloeon
small minnow mayflies
Heterocloeon is a genus of small minnow mayflies in the family Baetidae, containing approximately nine described species. These mayflies are part of the diverse Baetidae family, which is one of the largest families of mayflies. The genus was established by McDunnough in 1925. Species within this genus have been studied in relation to environmental modifications, particularly the effects of reservoir impoundment on their life history.
Heterocloeon curiosum
curious small minnow mayfly
Heterocloeon curiosum is a small minnow mayfly in the family Baetidae, native to North America. It has been studied in Virginia river systems, where it demonstrates bivoltine life history with two summer generations. Reservoir construction with surface release can significantly alter its emergence timing, larval density, and fecundity through thermal regime changes.
Heterocloeon petersi
small minnow mayfly
Heterocloeon petersi is a small minnow mayfly species in the family Baetidae, first described by Müller-Liebenau in 1974. It is recorded from the southeastern United States. As a member of Baetidae, it belongs to one of the most diverse families of mayflies, though specific biological details for this species remain limited in published literature.
Iswaeon anoka
small minnow mayfly
Iswaeon anoka is a species of small minnow mayfly in the family Baetidae, first described by Daggy in 1945. The species is currently recognized under the genus Iswaeon, though it has been treated as a synonym of Heterocloeon anoka in some taxonomic databases. Like other members of Baetidae, it belongs to the diverse group of small mayflies commonly found in freshwater habitats.
Labiobaetis
Labiobaetis is a genus of small mayflies in the family Baetidae, comprising over 150 described species distributed across tropical and temperate regions worldwide. The genus exhibits exceptional diversity in Southeast Asia, New Guinea, and Indonesia, with significant representation also in Africa, India, and western North America. Species identification relies primarily on larval morphology, particularly characters of the mouthparts, antennae, and gills. Adults are generally difficult to distinguish at the generic level.
Neocloeon
Neocloeon is a genus of mayflies in the family Baetidae. The species Neocloeon triangulifer has emerged as an important laboratory model organism for aquatic ecotoxicology and physiological studies due to its sensitivity to environmental stressors and ability to complete its life cycle in controlled conditions. The genus is distinguished by parthenogenetic reproduction in at least some populations, a trait that facilitates laboratory culture. Species in this genus inhabit freshwater streams and serve as bioindicators for water quality assessment.
Paracloeodes
Paracloeodes is a genus of small minnow mayflies in the family Baetidae, established by Day in 1955. The genus contains at least 23 described species distributed across the Americas, with the highest diversity concentrated in the Neotropical region. Nymph-adult associations have been established for only nine species, indicating significant gaps in life stage knowledge. Recent taxonomic work has focused on describing new species and clarifying previously unknown adult stages, such as for P. carolinae.
Paracloeodes minutus
small minnow mayfly
Paracloeodes minutus is a small minnow mayfly in the family Baetidae. It is found in Central America and North America, including southeastern Canada, northern Mexico, and the continental United States. The species was described by Daggy in 1945.
Plauditus
small minnow mayflies
Plauditus is a genus of small minnow mayflies in the family Baetidae, established by Lugo-Ortiz & McCafferty in 1998. The genus contains approximately 10 described species distributed in North America. These mayflies are aquatic insects with larvae that exhibit considerable morphological and color variation, particularly in abdominal patterning.
Plauditus cestus
Plauditus cestus is a small mayfly in the family Baetidae, widespread across eastern and central North America. Recent records have extended its known range substantially, including a 1900 km northwestward expansion to the Northwest Territories. The species exhibits notable larval color variation, with some populations showing pronounced abdominal segment coloration.
Plauditus dubius
small minnow mayfly
Plauditus dubius is a species of small minnow mayfly in the family Baetidae. It has been documented across a broad geographic range including all of Canada, the northern and southeastern United States, and Alaska. The species belongs to a genus of mayflies commonly associated with running water habitats. Limited observational records exist, with only three documented observations in iNaturalist.
Procloeon nelsoni
Procloeon nelsoni is a species of small minnow mayfly in the family Baetidae, described by Wiersema in 1999. It is known from the southern United States. As a member of Baetidae, it belongs to a diverse family of mayflies commonly associated with running water habitats.
Procloeon vicinum
Procloeon vicinum is a species of small minnow mayfly in the family Baetidae. It belongs to a genus of mayflies commonly found in freshwater habitats across North America. The species was described by Hagen in 1861 and is currently accepted as valid. Like other members of Baetidae, it likely inhabits running waters and exhibits the typical mayfly life cycle of aquatic nymphal stages followed by short-lived winged adults.
Procloeon viridoculare
small minnow mayfly
Procloeon viridoculare is a species of small minnow mayfly in the family Baetidae. It was first described by Berner in 1940 under the basionym Centroptilum viridocularis. The species is known from North America. Like other members of Baetidae, it belongs to a diverse family of mayflies commonly associated with freshwater habitats.