Phallobrycort synarmacanthus, a new species of Stevardiinae from the Xingu basin, Brazil (Teleostei: Characidae)

Abstract

Phallobrycon synarmacanthus, new species, is described from the rio Bacajai (right bank tributary of the rio Xingu). It is recognized based on the presence of bilaterally arranged bony hooks on the last unbranched and anterior 11 or 12 branched anal-fin rays of sexually mature males, the presence of a set of 3 to 5 hypertrophied spines on the unbranched portion of the fifth branched anal-fin ray partially connected to each other by a lamellar crest-like bony projection, the presence of 35-38 perforated lateral line scales and 35-36 vertebrae. The putative phylogenetic position of the genus among the Diapomini (Stevardiinae) is proposed. © 2016 by Verlag Dr. Friedrich Pfeil, München, Germany.