Astyanax goyanensis (Miranda-Ribeiro, 1944), new combination and Astyanax courensis, new species (Ostariophysi: Characiformes): two Characidae from the upper rio Tocantins basin, Central Brazil

Abstract

Astyanax goyanensis (Miranda-Ribeiro, 1944), new combination, is redescribed based on the type series and topotypes, and A. courensis, new species, is herein described. Both species were collected in the rio dos Couros basin, upper rio Tocantins basin, Chapada dos Veadeiros, Goiás State, Brazil. These species possess the characters and general body morphology of the species of the Astyanax scabripinnis species complex. The new combination of Astyanax goyanensis is supported by the absence of characters that define Astyanacinus. Astyanax goyanensis and A. courensis differ from their congeners by meristic and morphometric characters, and color pattern. Astyanax goyanensis has only seven pelvic-fin rays, an uncommon character in the species of this genus, and A. courensis possesses only three or four scale rows below the lateral-line, fewer than typical of the genus.Astyanax goyanensis (Miranda-Ribeiro, 1944), nova combinação, é redescrita com base na série-tipo e topótipos, e A. courensis, espécie nova, é descrita. Ambas espécies foram coletadas na bacia do rio dos Couros, bacia do alto rio Tocantins, Chapada dos Veadeiros, Goiás, Brasil. Estes táxons possuem os caracteres e morfologia do corpo das espécies do complexo Astyanax scabripinnis. A transferência e nova combinação de Astyanax goyanensis devem-se a ausência de caracteres que definem Astyanacinus. Astyanax goyanensis e A. courensis diferem das congêneres por caracteres merísticos, morfométricos e padrão de colorido. Astyanax goyanensis possui apenas sete raios na nadadeira pélvica, caráter incomum nas espécies do gênero, e A. courensis possui apenas três ou quatro séries de escamas abaixo da linha lateral, menos do que típico do gênero.

Revision of the Astyanax orthodus species-group (Teleostei: Characidae) with descriptions of three new species

“…nov. (Cenepa River drainage, upper Amazon) -Chevrons overlying lateral stripe extended vertically by prolongations from dorsal and ventral tips over three horizontal rows of scales; caudal-peduncle spot conspicuous ……………………7 (De Filippi, 1853). E. A. courensis Bertaco, Carvalho & Jerep, 2010(modified from Bertaco et al 2010. The anterior humeral spot consists of two overlapping layers of pigment identified by numbers 1 and 2 (see Román-Valencia et al 2015: fig.…”

Gill‐derived glands in species of Astyanax (Teleostei: Characidae)

“…() cited published observations (most of them macroscopic) about the absence of a gill‐derived gland in Astyanax courensis, A. goyanensis, A. jordanensis, A. laticeps, A. obscurus and A. utiariti; Ectrepopterus uruguayensis; Hasemania kalunga; Hemigrammus ora, H. tocantinsi, Hyphessobrycon melanostichos, H. notidanos and H. vinaceus; and Oligosarcus itau (Carvalho and Bertaco ; Bertaco and Garutti ; Bertaco et al . , ; Vera Alcaraz et al . ; Bertaco and Carvalho ; Bertaco and Lucena ; Carvalho et al .…”

Interpopulational comparative cytogenetics analysis among three Astyanax (Characiformes: Incertae Sedis) species of two streams of upper Paraná River basin, Brazil

“…Astyanax scabrip-Cytogenetics in Astyanax species innis (Jenyns, 1842), Astyanax fasciatus (Cuvier, 1819) and Astyanax altiparanae Garutti & Britski, 2000 have been considered a "species complex", characterized by morphologically very similar species (Souza & MoreiraFilho 1995;Fernandes & Martins-Santos 2004;Pazza et al 2006). The Astyanax scabripinnis complex, for example, is comprised of 17 species, including Astyanax paranae Eigenmann, 1914(Bertaco & Lucena 2006Bertaco et al 2010).…”