LAUSR

A new species of Parotocinclus is described from lower rio Pardo basin, Bahia, Brazil. The new species differs from the majority of its congeners by the presence of a rudimentary or vestigial adipose fin, restricted to 1-3 small unpaired plates on the typical location of the fin. The new species differs from congeners that lack a well-developed adipose fin, and also from various other congeners, by a series of features including the absence of unicuspid accessory teeth and abdomen completely covered by plates similar in size. Additionally, mature males of the new species possess hypertrophied and higher number of olfactory lamellae, when compared to similar sized or even larger females. Hypertrophied and higher number of olfactory lamellae in males is shared with the congeners from the Northeastern Mata Atlântica freshwater ecoregion examined to the feature. This article is protected by copyright. All rights reserved.