Riffle-beetle
Guides
Optioservus trivittatus
Optioservus trivittatus is a species of riffle beetle in the family Elmidae. It is found in North America, with records from Canada including New Brunswick, Newfoundland, Nova Scotia, and Ontario. Riffle beetles in this family are aquatic insects typically associated with running water habitats. The species was described by Brown in 1930 and has been subject to taxonomic revision based on male genitalia, elytral patterns, and geographic distribution.
Ordobrevia nubifera
Ordobrevia nubifera is a species of riffle beetle in the family Elmidae. It was described by Fall in 1901. The species is currently treated as a synonym of Ordobrevia nubifer. It is known from North America.
Oulimnius
Oulimnius is a genus of riffle beetles in the family Elmidae, containing approximately 15 described species. These beetles are aquatic and inhabit running water environments. The genus has been the subject of molecular phylogenetic studies, particularly for the O. tuberculatus species group, which revealed cryptic diversity and supported the re-validation of O. perezi as a distinct species.
Oulimnius latiusculus
Oulimnius latiusculus is a species of riffle beetle in the family Elmidae, first described by LeConte in 1866. Riffle beetles are aquatic insects typically associated with flowing water habitats. The species is known from North America, with records from Canada including New Brunswick and Newfoundland.
Oulimnius nitidulus
riffle beetle
Oulimnius nitidulus is a species of riffle beetle in the family Elmidae, described by LeConte in 1866. It is distributed across North America. Riffle beetles in this genus are aquatic insects adapted to flowing water environments. The species was originally described under the basionym Elmis nitidula.
Phanocerus clavicornis
riffle beetle
Phanocerus clavicornis is a small riffle beetle in the family Elmidae, measuring approximately 3 mm in length. The species exhibits a broad Neotropical distribution, ranging from Texas and the Caribbean through Central America to southeastern Brazil. Populations in Atlantic Rainforest streams demonstrate significant phenotypic plasticity in body size in response to hydraulic conditions, with smaller larvae occurring during periods of greater rainfall. Both larvae and adults are fully aquatic and occupy the same freshwater environments.
Promoresia tardella
Promoresia tardella is a species of riffle beetle in the family Elmidae, originally described by Fall in 1925. The species has undergone taxonomic reclassification, with modern sources treating it as a synonym of Optioservus tardellus. It has been recorded from North America, specifically from Vermont in the United States. As an elmid beetle, it likely inhabits freshwater environments, though specific ecological details remain poorly documented.
Rhizelmis
Rhizelmis is a genus of riffle beetles (family Elmidae) established by Chandler in 1954. These beetles are aquatic insects inhabiting running water environments. The genus is part of the tribe Elmini within the subfamily Elminae.
Stenelmis bicarinata
riffle beetle
Stenelmis bicarinata is a species of riffle beetle in the family Elmidae, first described by LeConte in 1852. Riffle beetles are aquatic insects associated with running water habitats. The species occurs in Central and North America, though detailed ecological studies remain limited.
Stenelmis cheryl
Cheryl's Riffle Beetle
Stenelmis cheryl, commonly known as Cheryl's riffle beetle, is a species of riffle beetle in the family Elmidae. The species was described by Brown in 1987. Riffle beetles are aquatic insects typically associated with flowing water habitats. Stenelmis cheryl has been documented in Central America and North America based on occurrence records.
Stenelmis concinna
riffle beetle
Stenelmis concinna is a species of riffle beetle in the family Elmidae, described by Sanderson in 1938. Riffle beetles are aquatic insects that inhabit flowing water environments. The species is known from North America, with distribution records including Québec, Canada. As a member of the genus Stenelmis, it shares the family characteristic of being fully aquatic in both larval and adult stages.
Stenelmis crenata
riffle beetle
Stenelmis crenata is a species of riffle beetle in the family Elmidae, occurring in North America. It inhabits fast-flowing stream environments, particularly riffle habitats in tallgrass prairie streams. The species exhibits a multivoltine life cycle with overlapping cohorts and year-round larval presence. Adults are active from late spring through autumn.
Stenelmis decorata
Stenelmis decorata is a species of riffle beetle in the family Elmidae, described by Sanderson in 1938. Riffle beetles are aquatic insects associated with flowing water habitats. The species is known to occur in North America.
Stenelmis grossa
riffle beetle
Stenelmis grossa is a species of riffle beetle in the family Elmidae, described by Sanderson in 1938. Riffle beetles are aquatic insects typically associated with running water habitats. The species is known from North America, though specific details regarding its biology, ecology, and distribution within that range remain limited in published literature.
Stenelmis lignicola
riffle beetle
Stenelmis lignicola is a species of riffle beetle in the family Elmidae, described in 1992. The specific epithet "lignicola" derives from Latin roots meaning "wood-dweller," suggesting an association with woody substrates. As a member of the riffle beetle family, it is adapted to aquatic or semi-aquatic environments with flowing water. The species is known from North America.
Stenelmis mera
Stenelmis mera is a species of riffle beetle in the family Elmidae, first described by Sanderson in 1938. It belongs to a genus of small, aquatic beetles commonly found in running water habitats. The species is documented from eastern North America, with records from New Brunswick and Nova Scotia in Canada. Like other elmid beetles, it is associated with freshwater stream environments where larvae develop in submerged substrates.
Stenelmis mirabilis
riffle beetle
Stenelmis mirabilis is a species of riffle beetle in the family Elmidae, described by Sanderson in 1938. Riffle beetles are aquatic insects typically associated with flowing water habitats. The species is recorded from North America, though specific details about its biology and ecology remain limited in published literature.
Stenelmis occidentalis
Neararctic Riffle Beetle
Stenelmis occidentalis is a species of riffle beetle in the family Elmidae, described by Schmude and Brown in 1991. Riffle beetles are aquatic insects adapted to life in fast-flowing freshwater habitats. The species is found in both Central America and North America, reflecting a transcontinental distribution across the Nearctic region.
Stenelmis parva
Stenelmis parva is a species of riffle beetle in the family Elmidae, described by Sanderson in 1938. The species occurs in North America. Like other members of the genus Stenelmis, it inhabits aquatic environments with flowing water.
Stenelmis sexlineata
riffle beetle
Stenelmis sexlineata is a riffle beetle in the family Elmidae, described by Sanderson in 1938. It inhabits flowing water environments in North America and has a multi-year life cycle with distinct larval stages. Like other elmid beetles, it is adapted to life in fast-moving streams and rivers.
Stenelmis sinuata
riffle beetle
Stenelmis sinuata is a species of riffle beetle in the family Elmidae, described by LeConte in 1852. It is found in North America. Riffle beetles are aquatic beetles that inhabit flowing water environments.
Zaitzevia
riffle beetles
Zaitzevia is a genus of riffle beetles (family Elmidae) comprising approximately 19–29 described species, depending on taxonomic treatment. The genus was established by George Charles Champion in 1923 and is named after Russian entomologist Filipp Zaitsev. Species diversity is concentrated in East, Southeast, and Central Asia, with additional representation in North America. Chinese species are particularly well-documented, with multiple new species described from Sichuan, Yunnan, Hunan, Hubei, and Guizhou provinces.
Zaitzevia parvula
riffle beetle
Zaitzevia parvula is a species of riffle beetle in the family Elmidae. It was described by Horn in 1870. The species is found in North America, with records from Alberta and British Columbia in Canada. Two subspecies are recognized: Z. p. parvula and Z. p. thermae.