Optioservus canus, the pinnacles optioservus riffle beetle, is a species of riffle beetle in the family Elmidae. It is found in North America.[1][2][3]
White, D. S. (1978). "A revision of the Nearctic Optioservus (Coleoptera: Elmidae), with descriptions of new species". Systematic Entomology. 3 (1): 59–74. doi:10.1111/j.1365-3113.1978.tb00390.x.
Čiampor, Fedor Jr; Čiamporová-Zaťovičová, Zuzana (2019). "World Elmidae". Slovak Academy of Sciences. Retrieved 2019-07-02.
Lobl, I.; Smetana, A., eds. (2006). Catalogue of Palaearctic Coleoptera, Volume 3: Scarabaeoidea - Scirtoidea - Dascilloidea - Buprestoidea - Byrrhoidea. Apollo Books. ISBN978-90-04-30914-2.