Simpsonichthys delucai

description

Description Morphometric data appear in Table 7. Largest specimen examined 22.1 mm SL, but in aquarium reaching at least about 28 mm SL. Dorsal profile slightly concave on head, convex from nape to end of dorsal-fin base, about 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 dorsolateral portion of side of head. Snout blunt. Urogenital papilla cylindrical and short in males, pocket-shaped in females. Tip of dorsal rounded to slightly pointed in males, rounded in females; anal fin rounded in both sexes; median anal-fin rays long in females, anal fin spatula-shaped. Minute filamentous rays on posterodistal border of dorsal fin in males, tips reaching vertical through caudal peduncle; no filamentous rays on anal fin. Caudal fin subtruncate in males, round in females. Pectoral fins elliptical. Posterior margin of pectoral fins reaching vertical between base of 4 th and 6 th anal-fin ray in males, and reaching anus in females. Tip of each pelvic fin reaching between base of 2 nd and 4 th anal-fin ray i

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

diagnosis

Diagnosis Similar to S. alternatus and S. fasciatus and distinguished from the remaining species of the S. flammeus group by possessing a distal red bar on caudal fin in males (vs. broad metallic blue bar), a red distal stripe on anal fin in males (vs. no distinctive distal stripe), short to minute filamentous rays on tip of dorsal fin in males (vs. long filaments), and anal fin rounded in males (vs. pointed); differs from S. alternatus and S. fasciatus by having dorsal fin rounded to slightly pointed in males (vs. pointed), dorsal fin reddish brown, with light greenish yellow spots and three or four brown bars restricted to posterobasal portion in males (vs. six to eight bars through whole fin), and dark brown to black bars on flank in males (vs. reddish gray bars).

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

distribution

Distribution Rio Urucuia floodplains, rio Sao Francisco basin, Estado de Minas Gerais, Brazil (Fig. 4).

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

materials_examined

Material examined Brazil: Estado de Minas Gerais, rio Urucuia drainage, rio Sao Francisco basin: MCP 28572, holotype, male, 21.4 mm SL; MCP 28573, 1 paratype; UFRJ 5426, 17 paratypes; UFRJ 5427, 4 paratypes (c & s); temporary pool near the city of Urucuia, approximately 16 ° 08 ’ S 45 ° 45 ’ W; altitude 498 m; A. C. De Luca & D. H. B. Padrao, 27 Jan. 2001.

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