A new species of armored catfish Parotocinclus (Siluriformes: Loricariidae) from the rio Parnaíba basin, Northeastern, Brazil

Abstract

Recent taxonomic studies indicated the presence of several undescribed species in the rio Parnaíba basin. Among thosea new species of Parotocinclus endemic of this drainage is herein described. It differs from most of its congenersincluding the sympatric P. haroldoi and P. cearensisby a vestigial or rudimentary adipose fin (vs. conspicuous adipose fin). This character is also present in P. bidentatus and P. muriaensis (both from the rio Paraíba do Sul basinsoutheastern Brazil)P. spilurus (rio Jaguaribe basinnortheastern Brazil)P. seridoensis (rio Piranhas-Açu basinnortheastern Brazil)P. halbothi (rios Trombetas and Marowijne basinsnorthern Brazil and Suriname) and P. dani (from rio Tapajós in Mato Grosso StateBrazil). The new species differs from these latter species mainly by the abdomen extensively covered by broad dermal plates. It also differs from P. haroldoi and P. cearensis by light bands between the snout tip and the nostrils.