A new species of leaffsh Polycentrus Müller & Troschel, 1849 (Percomorpha: Polycentridae) from the rio Negro, Brazil

  • Daniel Pires Coutinho and Wolmar Benjamin Wosiacki Abstract

    Zitat

    A new species of Polycentrus is described from the rio Negro, in Brazil. It is distinguished from P. schomburgkii by the presence of two dark postocular and one subocular band, all smaller than orbital diameter, blunt snout, isognathous mouth, reduction of the serrations on the lower edge of the lacrimal-spines ranging from zero to two tiny spines at the posterior end, intensely serrated edge of the interopercle, fully serrated posterior edge of the vertical arm of the preopercle, presence of fve pungent opercular spines, subopercle broadly serrated along most of its posterior ventral edge, presence of serrations dorsally on the posterior margin of the cleithrum, fourth ray of pectoral fn reaching the vertical through the anal-fn origin, 19-21 predorsal scales, 19-20 scales on dorsal-fn base, 12-14 scales on anal-fn base, and absence of a median opercular blotch.

    Quelle: Neotropical Ichthyology, 12(4): 747-753, 2014