Ancistrus brevipinnis

Ancistrus brevipinnis is endemic to Brazil where it is found in the drainage basin of the Lagoa dos Patos in the Brazilian state of Rio Grande do Sul. This species is found in various habitats but it is more common in mountain streams where this species moves along the rocky bed or through the spaces between gravel and stones, it is more active at night.

== References ==

Ancistrus brevipinnis is classified in the genus Ancistrus, a name coined by Rudolf Kner but when he proposed the genus Kner did not explain the etymology of the name. It is thought to be from the Greek ágkistron, meaning a "fish hook" or the "hook of a spindle", a reference to the hooked odontodes on the interopercular bone. The specific name, brevifilis, means "short fin" an allusion Regan did not explain but it may refer to the shorter dorsal fin spine than the other species Regan placed in the genus Xenocara.