Two new species of the genus Astyanax (Characiformes, Characidae) from the Paraná river basin in Argentina

Abstract

Two new species of the genus Astyanax (Characiformes, Characidae) from the Parana river basin, in Argentina. -Astyanax leonidas and A. troya are described from the rio Parana basin in northeastern Argentina. Both species share similar number of anal-fin rays and perforated scales in the lateral line, one maxillary tooth, a deep dentary and the presence of small hooks on pectoral, pelvic, anal, and caudal fin of males. These characters are also present in A. ojiara and separate the three species from the remaining species of the genus. Astyanax leonidas is differenciated by the robust body, dorsal profile almost straight, a long and slender maxillary tooth, teeth of premaxillary inner row with notable long central cusp, dentary teeth of similar shape than those of premaxilla, and 4 large dentary teeth followed by one intermediate tooth, and 3 or 4 small teeth. Also this species does not have hooks on dorsal-fin rays and pelvic axillary scale. Astyanax troya has a dorsal profile with marked concavity on supraoccipital area, one broad and low pentacuspid maxillary teeth, teeth of inner premaxillary row gently expanded distally with cusps arising in the same line, central cusp of premaxillary teeth scarcely longer, 8-10 dentary teeth decreasing in size anteroposteriorly, and males with hooks in all fins and pelvic axillary scale.

Five new species of genus Astyanax Baird & Girard, 1854 from Rio Iguaçu, Paraná, Brazil (Ostariophysi, Characiformes, Characidae)

“…They also examined the taxonomic status of Astyanax trierythropterus Godoy, 1970 and Astyanax bipunctialbicaudalis Godoy, 1977, both from Rio Mogi-Guaçu, and examined references to Astyanax fasciatus (Cuvier, 1819) and Astyanax eigenmanniorum (Cope, 1894) for Rio Paraná. Azpelicueta et al (2002) and Casciotta et al (2003) had described new species for this genus from Rio Paraná, Argentina. From south Brazil, Bertaco and Malabarba (2001) describe two species related to Astyanax scabripinnis (Jenyns, 1842), one of them from the headwaters of Rio Uruguay.…”

Astyanax henseli, a new name for Tetragonopterus aeneus Hensel, 1870 from southern Brazil (Teleostei: Characiformes)

“…The characid genus Astyanax Baird & Girard, 1854, includes 92 valid and more than one hundred nominal species ranging from Texas to northeastern Argentina (Azpelicueta et al, 2002;Azpelicueta et al, 2003;Casciotta et al, 2003;Lima et al, 2003:106;Lima & Jahnsen, 2004;Bertaco & Lucinda, 2005;Haluch & Abilhoa, 2005). Eigenmann (1921Eigenmann ( , 1927 was the only author who revised the genus Astyanax.…”

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

“…Azpelicueta et al . ; Melo and Buckup ). The presence of secondary sexual glands was originally found in species having insemination or unusual secondary sexual characters ( e.g.…”