The Loricariidae (armored catfishes) is the most species-rich family of the order Siluriformes with more than 915 valid species. One of its subfamilies, the Loricariinae, includes 238 valid species (Nelson et al., 2016). Fishes in this subfamily are recognized by an elongated and strongly depressed caudal peduncle, and by the lack of an adipose fin (Covain & Fisch-Muller, 2007). A great morphological variation has been observed in this subfamily, which has led to the recognition of 31 genera, several of them monotypic, and others with a
