Author: de Santana & Vari, 2013
Remark: Populations previously identified as <i>A. leptorhynchus</i> based on samples originating in various rivers draining into Lago Maracaibo in both Colombia and Venezuela were found to be <i>A. anu</i> based on the collecting localities (Ref. 93867).
Comments: Inhabits swift current habitats over substrates of rounded stones. It was observed that this species is a voracious nocturnal predator (Ref.  93867).