OulimniusOulimnius is a genus of riffle beetles in the family Elmidae. There are about 15 described species in Oulimnius.SpeciesThese 15 species belong to the genus Oulimnius:Oulimnius aegyptiacus Oulimnius bertrandi Berthélemy, 1964Oulimnius cyneticus Berthélemy, 1980Oulimnius echiinatus Berthélemy, 1979Oulimnius fuscipes Oulimnius hipponensis Berthélemy, 1979Oulimnius jaechi Hernando, Ribera & Aguilera, 1998Oulimnius latiusculus Oulimnius maurus Berthélemy, 1979Oulimnius nitidulus Oulimnius perezi Oulimnius reygassei Oulimnius troglodytes Oulimnius tuberculatus Oulimnius villosus Berthélemy, 1979