Abstract
Elmidae is one of the most diverse and widespread families of aquatic beetles, comprising approximately 1300 species in 146 genera. Their greatest diversity is found in mountain streams of tropical and subtropical regions. Both Elmidae larvae and adults are aquatic and the family is divided into two subfamilies, Larainae and Elminae, which is the richest one. Hexacylloepus Hinton, 1940 is…