A new species of sexually dimorphic Pareiorhaphis Miranda Ribeiro, 1918 (Siluriformes: Loricariidae) from the rio Doce basin, Brazil

Abstract

Pareiorhaphis nasuta, a new neoplecostomine catfish of the family Loricariidae is described. The species was collected from headwaters of the rio Matipó, tributary of the upper rio Doce basin in State of Minas Gerais, Brazil. The new species is readily diagnosed from all remaining congeners by the longer snout and by the smaller orbital diameter. The new species is the first representative of the genus Pareiorhaphis discovered in the rio Doce basin, thus expanding its geographic distribution. A phylogenetic diagnosis for Pareiorhaphis is presented.Pareiorhaphis nasuta, um novo cascudo neoplecostomíneo da família Loricariidae é descrito. Os exemplares foram capturados nas cabeceiras do rio Matipó, tributário do rio Doce no Estado de Minas Gerais, Brasil. A nova espécie é facilmente diagnosticada entre todos os demais congêneres pelo maior comprimento do focinho e pelo menor diâmetro orbital. Esta nova espécie representa o primeiro registro do gênero Pareiorhaphis na bacia do rio Doce, expandindo a sua distribuição geográfica. Uma diagnose filogenética é apresentada para Pareiorhaphis.

A New Distinctively Colored Catfish of the Genus Pareiorhaphis (Siluriformes: Loricariidae) from the Rio Piracicaba, Upper Rio Doce Basin, Brazil

“…The new taxon shows all the diagnostic features of Pareiorhaphis (see Sexual dimorphism) as proposed by Pereira et al (2007).…”

“…Two species of Pareiorhaphis were reported previously from the Rio Doce basin: Pareiorhaphis nasuta and P. scutula (Pereira et al, 2007(Pereira et al, , 2010. With the recognition that Pareiorhaphis proskynita is distinct, the genus Pareiorhaphis now contains three species in the Rio Doce basin.…”

“…Measurements and counts were taken as described by Pereira et al (2007), excluding those inapplicable: pre-adipose length; adipose to caudal fin distance; adipose-fin spine length; number of plates between dorsal and adipose fins; number of plates between adipose and caudal fins; and preadipose azygous plates, due to the absence of adipose fin on the new taxon. Preadipose azygous plates are replaced by azygous plates (number of all unpaired plates covering the area otherwise occupied by the adipose fin).…”

“…R ECENT ichthyological surveys in the headwaters of tributaries of upper Rio Doce system uncovered, in a short period of time, two new species of the catfish genus Pareiorhaphis: P. nasuta Pereira, Vieira and Reis (2007), from the Rio Matipó basin; and P. scutula Pereira, Vieira and Reis (2010), from the Rio Piracicaba basin. Advances in the taxonomy of Pareiorhaphis are mostly due to the studies of the genus undertaken by Pereira and Reis (2002) and Pereira (2005), with nine of its valid species described in the last ten years (Eschmeyer and Fricke, 2011).…”

Two new species of cascudinhos of the genus Otothyropsis (Siluriformes: Hypoptopomatinae) from the rio Paraná basin, Brazil

“…Counts of plates, rays and dentary and premaxillary teeth were also performed under the scope. Dermal plate counts followed the schemes of serial homology and terminology proposed by Schaefer (1997), and the morphometric measurements are those described by Pereira et al 2007 with the addition of prepelvic length (measured from the snout tip to the pelvic-fin origin), dorsal-fin base length (measured from the dorsal-fin origin to the end of the dorsal-fin base), pectoral-pelvic distance (measured from the pectoral-fin origin to pelvic-fin origin), pelvic-anal distance (measured from the pelvic-fin origin to anal-fin origin), internareal distance (measured transversely between the inner posterior margins of the nares), and prenasal length (measured from the snout tip to the anterior margin of the naris). Morphometric measures were treated as percents of standard length (SL), except for subunits of the cephalic region, treated as percents of head length (HL).…”