Simpsonichthys gibberatus

description

Description Morphometric data appear in Table 4. Largest specimen examined 27.9 mm SL. Dorsal profile convex from snout to end of dorsal-fin base, approximately straight on caudal peduncle. Ventral profile convex from lower jaw to end of anal-fin base, nearly straight on caudal peduncle. Body moderately deep, compressed, greatest body depth at level of pelvic-fin base in male, at level of posterior margin of opercle in females. Eye positioned on dorsal portion of head side. Snout blunt. Urogenital papilla cylindrical and short in males, pocket-shaped in females. Tip of dorsal and anal fins pointed and with short filamentous rays in males, tip of longest filament reaching vertical through caudal-fin base. Dorsal and anal fins rounded in females, anal fin slightly lengthened. Most dorsal-fin rays unbranched. Caudal fin rounded. Pectoral fins elliptical. Posterior margin of each pectoral fin reaching vertical between base of 6 th and 8 th anal-fins ray in males, and base of 3 rd anal-fins ray in females. Tip of each pelvic fin reaching between base of 3 rd and 4 th anal-fin rays in males, reaching urogenital papilla in females. Pelvic-fin bases medially in contact. Dorsal-fin origin a

Taxonomic revision of the seasonal South American killifish genus Simpsonichthys (Teleostei: Cyprinodontiformes: Aplocheiloidei: Rivulidae).

diagnosis

Diagnosis Differs from all congeners by a pronounced convexity on dorsal profile between posterior portion of head and anterior portion of trunk in females, greatest body depth at level of posterior margin of opercle (vs. at level of pelvic-fin base).

Taxonomic revision of the seasonal South American killifish genus Simpsonichthys (Teleostei: Cyprinodontiformes: Aplocheiloidei: Rivulidae).

distribution

Distribution Middle rio Preto drainage, a part of rio Paracatu drainage, rio Sao Francisco basin, Unai, Estado de Minas Gerais, Brazil (Fig. 1).

Taxonomic revision of the seasonal South American killifish genus Simpsonichthys (Teleostei: Cyprinodontiformes: Aplocheiloidei: Rivulidae).

materials_examined

Material examined Brazil: Estado de Minas Gerais, rio Paracatu drainage, rio Sao Francisco basin: UFRJ 6373, holotype, male, 27.9 mm SL; UFRJ 6374, 11 paratypes; UFRJ 6375, 6 paratypes (c & s); MCP 39933, 4 paratypes; Brazil: Estado de Minas Gerais: Unai, temporary pool about 2 km from the right bank of rio Preto, rio Paracatu drainage, rio Sao Francisco basin; G. C. Brasil, 14 Feb. 2006.

Taxonomic revision of the seasonal South American killifish genus Simpsonichthys (Teleostei: Cyprinodontiformes: Aplocheiloidei: Rivulidae).