Simpsonichthys nielseni

description

Description Morphometric data appear in Table 4. Largest specimen examined 40.5 mm SL. Dorsal profile convex from snout to end of dorsal-fin base, nearly straight on caudal peduncle. Ventral profile convex from lower jaw to end of anal-fin base, approximately straight on caudal peduncle. Body moderately deep, compressed, greatest body depth at level of pelvic-fin base. Eye positioned on dorsal portion of head side. Snout blunt. Urogenital papilla cylindrical and short in males, pocket-shaped in females. Tip of dorsal fin pointed. Tip of anal fin pointed in males, rounded in females. Short filamentous rays on tip of dorsal and anal fins in males; tip of filaments reaching vertical through caudal-fin base. Anterior and posterior rays of dorsal fin, including rays on tip of fin, unbranched; median rays branched. Caudal fin subtruncate in males, rounded in females. Pectoral fins elliptical. Posterior margin of each pectoral fin reaching vertical between base of 4 th and 6 th anal-fins ray in males, and through pelvic-fin base in females. Tip of pelvic fin reaching between base of 3 rd and 4 th anal-fin rays in males, and between urogenital papilla and base of 1 st anal-fin ray in femal

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

diagnosis

Diagnosis Distinguished from all other congeners by having six or seven light greenish yellow stripes on caudal fin in males, parallel to fin rays, between fin base and fin margin, each stripe distally terminating in sharp tip and alternating with elongate spots of the same color on subdistal portion of fin.

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

distribution

Distribution Middle rio Sao Francisco floodplains, Pirapora, 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 Sao Francisco floodplains: UFRJ 6060, holotype, male, 37.0 mm SL; UFRJ 6061, 7 paratypes; UFRJ 6062, 5 paratypes (c & s); MCP 37306, 2 paratypes; temporary pool in Pirapora, 17 ° 21 ’ 59.6 ” S 44 ° 56 ’ 32.3 ” W; altitude 500 m; W. J. E. M. Costa & C. P. Bove, 22 Jan. 2005.

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