Heterelmis comalensis is a rare species of beetle known by the common name Comal Springs riffle beetle. It is endemic to Texas in the United States, where it occurs in only two springs. It is a federally listed endangered species of the United States.
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 riffles, feeding on algae and biofilms. There are more than 150 genera and 1,500 described species in Elmidae. The oldest record of the group is Cretohypsilara from the Cenomanian aged Burmese amber.
Heterelmis stephani was a rare species of aquatic beetle known by the common name Stephan's riffle beetle. It was endemic to Arizona in the United States, where it occurred in the Santa Rita Mountains before being declared presumed extinct. It was brown in color with small black dots on its wings.
Heterelmis obscura is a species of riffle beetle in the family Elmidae. It is found in Central America and South America.
Hexacylloepus ferrugineus, the rusty elmid, is a species of riffle beetle in the family Elmidae. It is found in Central America and North America.
Optioservus seriatus is a species of riffle beetle in the family Elmidae. It is found in North America.
Phanocerus clavicornis is a species of riffle beetle in the family Elmidae. It is found in the Caribbean Sea, Central America, North America, and South America.
Bryelmis siskiyou is a species of riffle beetle in the family Elmidae. It is found in North America.
Optioservus canus, the pinnacles optioservus riffle beetle, is a species of riffle beetle in the family Elmidae. It is found in North America.
Zaitzevia parvula is a species of riffle beetle in the family Elmidae. It is found in North America.
Cylloepus parkeri, or Parker's cylloepus riffle beetle, is a species of riffle beetle in the family Elmidae. It is found in North America.
Heterelmis vulnerata is a species of riffle beetle in the family Elmidae. It is found in Central America and North America.
Stenelmis lignicola is a species of riffle beetle in the family Elmidae. It is found in North America.
Dubiraphia brunnescens, the brownish dubiraphian riffle beetle, is a species of riffle beetle in the family Elmidae. It is found in North America.
Neocylloepus is a genus of riffle beetles in the family Elmidae. There are about eight described species in Neocylloepus.
Macrelmis shoemakei is a species of riffle beetle in the family Elmidae. It is found in Central America and North America.
Optioservus divergens is a species of riffle beetle in the family Elmidae. It is found in North America.
Stenelmis cheryl, or Cheryl's riffle beetle, is a species of riffle beetle in the family Elmidae. It is found in Central America and North America.
Dubiraphia harleyi is a species of riffle beetle in the family Elmidae. It is found in North America.
Stenelmis occidentalis is a species of riffle beetle in the family Elmidae. It is found in Central America and North America.
