''Optioservus'' is a genus of

riffle beetle Elmidae, commonly known as riffle beetles, is a family (biology), family of beetles in the superfamily Byrrhoidea described by John Curtis (entomologist), John Curtis in 1830. Both adults and larvae are usually aquatic, living under rocks in fas ...

s in the family

Elmidae Elmidae, commonly known as riffle beetles, is a family of beetles in the superfamily Byrrhoidea described by John Curtis in 1830. Both adults and larvae are usually aquatic, living under rocks in fast-flowing shallow areas of streams, such as ...

. There are about 13 described species in ''Optioservus''.

Species

* ''

Optioservus browni ''Optioservus browni'' is a species in the family Elmidae ("riffle beetles"), in the suborder Polyphaga ("water, rove, scarab, long-horned, leaf and snout beetles"). The species is known generally as the "Brown's optioservus riffle beetle". It ...

'' White, 1978 (Brown's optioservus riffle beetle) * ''

Optioservus canus ''Optioservus canus'', the pinnacles optioservus riffle beetle, is a species of riffle beetle in the family Elmidae. It is found in North America. References Further reading * * * Elmidae Articles created by Qbugbot Beetles descri ...

'' Chandler, 1954 (pinnacles optioservus riffle beetle) * ''

Optioservus castanipennis ''Optioservus castanipennis'' is a species of riffle beetle in the family Elmidae. It is found in North America. References Further reading * * * Elmidae Articles created by Qbugbot Beetles described in 1925 {{Elateriformia- ...

'' (Fall, 1925) * ''

Optioservus divergens ''Optioservus divergens'' is a species of riffle beetle in the family Elmidae. It is found in North America. References Further reading * * * Elmidae Articles created by Qbugbot Beetles described in 1874 {{Elateriformia-stub ...

'' (LeConte, 1874) * ''

Optioservus fastiditus ''Optioservus fastiditus'' is a species of riffle beetle in the family Elmidae. It is found in North America. References Further reading * * * Elmidae Articles created by Qbugbot Beetles described in 1850 Taxa named by John Lawre ...

'' (LeConte, 1850) * '' Optioservus heteroclitus'' White, 1978 * ''

Optioservus immunis ''Optioservus immunis'' is a species of riffle beetle in the family Elmidae. It is found in North America. References Further reading * * * Elmidae Articles created by Qbugbot Beetles described in 1925 {{Elateriformia-stub ...

'' (Fall, 1925) * ''

Optioservus ovalis ''Optioservus ovalis'' is a species of riffle beetle in the family Elmidae. It is found in North America. References Further reading * * * * Elmidae Articles created by Qbugbot Beetles described in 1863 Taxa named by John Lawren ...

'' (LeConte, 1863) * ''

Optioservus phaeus ''Optioservus phaeus'', the Scott optioservus riffle beetle, is a species of riffle beetle in the family Elmidae. It is only found in North America, specifically at Lake Scott State Park in Scott County, Kansas. References Further reading ...

'' White, 1978 (Scott optioservus riffle beetle) * ''

Optioservus quadrimaculatus ''Optioservus quadrimaculatus'' is a species of riffle beetle in the family Elmidae. It is found in North America. References Further reading * * * Elmidae Articles created by Qbugbot Beetles described in 1870 {{Elateriformi ...

'' (Horn, 1870) * ''

Optioservus sandersoni ''Optioservus sandersoni'' is a species of riffle beetle in the family Elmidae. It is found in North America. References Further reading * * * Elmidae Articles created by Qbugbot Beetles described in 1972 {{Elateriformia-stu ...

'' Collier, 1972 * ''

Optioservus seriatus ''Optioservus seriatus'' is a species of riffle beetle in the family Elmidae. It is found in North America. References Further reading * * * Elmidae Articles created by Qbugbot Beetles described in 1874 {{Elateriformia-stub ...

'' (LeConte, 1874) * ''

Optioservus trivittatus ''Optioservus trivittatus'' is a species of riffle beetle in the family Elmidae. It is found in North America. References Further reading * * * * Elmidae Articles created by Qbugbot Beetles described in 1930 {{Elateriformia ...

'' (Brown, 1930)