Simpsonichthys rosaceus

biology_ecology

Habitat Known only from a temporary pool in the border of the Atlantic forest, located in the narrow floodplain of the rio Pardo.

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

description

Description Morphometric data appear in Table 1. Largest specimen examined 29.6 mm SL. Dorsal profile weakly 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, nearly straight on caudal peduncle. Body moderately deep, compressed, greatest body depth at level of pelvic-fin base. Eye positioned on lateral portion of head side. Snout blunt to slightly pointed. Urogenital papilla cylindrical and short in males, pocket-shaped in females. Tip of both dorsal and anal fins slightly pointed in males, rounded in females. Tip of both dorsal and anal fins with filamentous rays in males, the dorsal-fin filaments reaching vertical through middle of caudal fin, tip of anal-fin filaments reaching vertical through base of caudal fin. Dorsal-fin rays unbranched. Caudal fin rounded. Pectoral fins elliptical. Posterior margins of pectoral fins reaching vertical through base of 4 th analfin ray in males and between pelvic-fin base and anus in females. Tip of each pelvic fin reaching base of 3 rd anal-fin ray in males and between urogenital papilla and anal-fin origin in females. Pelvic-fin bases

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

diagnosis

Diagnosis Similar to S. bokermanni and S. perpendicularis, and distinguished from other species of the Ophthalmolebias group by having pale golden bars restricted to anterior portion of flanks in males (vs. golden bars absent in S. constanciae, and bright greenish blue bars on the whole flank in S. suzarti). Similar to S. perpendicularis and distinguished from S. bokermanni by the absence of bright dots on the flanks and unpaired fins in males (vs. bright dots on dorsal fin, dorsal portion of caudal fin, and dorsal portion of flanks). Distinguished from S. perpendicularis in having pale red to pink unpaired fins (vs. yellow) and the absence of three brown stripes on the posterior portion of flanks (vs. presence).

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

distribution

Distribution Known only from the type locality, middle rio Pardo basin, Estado da Bahia, northeastern Brazil (Fig. 4).

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