Corydoras lymnades

materials_examined

Paratypes: 3 lots, 15 specimens — NUP 9965, 13, 23.0 – 29.0 mm SL; NUP 13834, 1 c & s, 24.7 mm SL; NUP 13835, 1 c & s, 23.1 mm SL: Brazil, Minas Gerais, Guarda-Mor, rio Guarda-Mor, rio São Francisco basin, 17 ° 46 ’ 18 ” S, 47 ° 05 ’ 43 ” W, C. H. Zawadzki, V. S. Ferreira, B. F. Morales & C. Pereira, 19 Jul 2008.

Catalog of type specimens of the fish collection of the Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura (NUP), Universidade Estadual de Maringá Paraná, Brazil

description

Description. Morphometric data presented in Table 1. Head compressed with slightly convex dorsal profile; roughly triangular in dorsal view. Snout rounded. Head profile convex from snout to tip of posterior process of parietosupraoccipital. Profile slightly convex along dorsal-fin base. Postdorsal body profile concave to adipose-fin spine; markedly concave from this point to caudal-fin base. Ventral profile of body nearly straight from isthmus to pectoral girdle; slightly convex from this point until pelvic girdle. Profile nearly straight from pelvic girdle to base of first anal-fin ray; slightly concave until caudal-fin base. Body roughly elliptical in cross section at pectoral girdle, gradually becoming more compressed towards caudal fin. Eye roughly elliptical, largest orbit diameter in oblique axis between top of head and upper lip. Eye located dorsolaterally on head; orbit delimited dorsally by frontal and sphenotic, ventrally by infraorbitals. Anterior and posterior nares close to each other, only separated by a flap of skin. Anterior naris tubular. Posterior naris close to anterodorsal margin of orbit, separated from it by distance equal to diameter of naris. Mouth small, su

A new Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the rio São Francisco basin, Brazil

diagnosis

Diagnosis. Corydoras lymnades is distinguished from most congeners, except C. aeneus, C. britskii, C. coppenamensis, C. difluviatilis, C. eques, C. garbei, C. multiradiatus, C. rabauti, C. splendens, and C. zygatus, by the anterior portion of the first infraorbital very large, conspicuously expanded towards the anteroventral margin of the snout and almost entirely covering its lateral margin (vs. anterior expansion small in C. hastatus, C. pygmaeus, and C. panda; or anterior expansion large, but not covering significantly the lateral margin of the snout in remaining species of Corydoras). The new species is distinguished from C. aeneus, C. britskii, C. difluviatilis, C. eques, C. garbei, C. multiradiatus, C. rabauti, C. splendens, and C. zygatus by the second infraorbital slender on its dorsal tip, contacting only sphenotic (vs. dorsal tip of second infraorbital wide, contacting sphenotic and compound pterotic by means of a triangular expansion). It is distinguished from C. coppenamensis by presence of two laterosensory canals on trunk (vs. three laterosensory canals on trunk). See additional diagnostic characters on identification key and discussion.

A new Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the rio São Francisco basin, Brazil

distribution

Distribution. Corydoras lymnades is known from upper and middle rio São Francisco basin, from headwater streams in the Minas Gerais State to the main channel of the river in the Bahia State, northeastern Brazil (Fig. 5).

A new Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the rio São Francisco basin, Brazil