Simpsonichthys bokermanni

description

Description Morphometric data appear in Table 1. Largest specimen examined 47.5 mm SL. Dorsal profile gently concave on head, convex from nape 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 lateral portion of side of head. Snout blunt to slightly pointed. Urogenital papilla cylindrical and short in males, pocket-shaped in females. Tip of dorsal and anal fins pointed in males, rounded in females. Tip of dorsal and anal fins with filamentous rays in males, tip of dorsal-fin filaments reaching vertical just anterior to posterior margin of caudal fin, tip of anal-fin filaments reaching vertical through middle of caudal fin. Dorsal-fin rays unbranched. Caudal fin rounded. Pectoral fins elliptical. Posterior margins of pectoral fins reaching vertical through base of 7 th anal-fin ray in males, and through base of 4 th anal-fin ray in females. Tip of each pelvic fin reaching base of 3 rd anal-fin ray in males and base of 1 st anal-fin ray in females. Pelvic-fin bases me

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

diagnosis

Diagnosis Distinguished from all other species of Ophthalmolebias by the unique asymmetrical distribution of greenish white dots in males, which are concentrated on the dorsal half of the caudal fin and usually are absent, sometimes minute, on ventral half of fin (vs. bright dots homogeneously distributed on caudal fin of S. constanciae and S. suzarti; absent in all other species of Ophthalmolebias), and the presence of white dots on dorsal fin in males (vs. white dots absent).

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

distribution

Distribution Floodplains of rio Cachoeira, Estado da Bahia, northeastern Brazil (Fig. 4).

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

materials_examined

Material examined Brazil: Estado da Bahia: Municipio de Ilheus, rio Cachoeira basin: MNRJ 11167, holotype, male, 40.5 mm SL; MNRJ 11168, 16 paratypes; MZUSP 28476, 1 paratype; MZUSP 28477, 1 paratype; MZUSP 28478, 1 paratype; MZUSP 28479, 1 paratype; swamp in CEPLAC; W. C. A. Bokermann, Dec. 1971. MNRJ 19503, 22; same locality; W. C. A. Bokermann, 30 Apr. 1972. MNRJ 11721, 9; MZUSP 38432, 2 (c & s); same locality as holotype; U. Caramaschi, H. R. Silva & L. Carcerelli, 10 Mar. 1986. UFRJ 1836, 13; UFRJ 2124, 4 (c & s); UFRJ 3162, 1 (c & s); UFRJ 5863, 1 (c & s); same locality; W. J. E. M. Costa & C. P. Bove, 17 Jun. 1993. MNRJ 19462, 6; Itabuna; no additional data.

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