A new species of Farlowella (Siluriformes: Loricariidae) of the F. Nattereri species-group from the Rio Xingu Basin, Mato Grosso, Brazil, with comments on Farlowella Jauruensis, a poorly-known species from the upper Rio Paraguai Basin

Abstract

A new species of Farlowella is described from eighteen specimens collected in the upper rio Xingu basin, Mato Grosso State, Brazil. The new species is a member of the Farlowella nattereri species-group and can be distinguished from other members of the group, with exception of Farlowella jauruensis, by exhibiting a proportionally shorter snout. The new species is distinguished from F. jauruensis by differences on the cleithrum and plate morphology, by counts of pelvic and caudal-fin rays, and by the color pattern of the snout. The discovery of new lots of F. jauruensis, a species so far known only from the holotype, is also herein reported. This discovery represents a considerable expansion of the geographic distribution and of the number of known specimens of F. jauruensis.