Simpsonichthys santanae

biology_ecology

Habitat Temporary pools within Mata de Galeria in the Cerrado.

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

description

Description Morphometric data appear in Table 2. Largest specimen examined 32.0 mm SL. Dorsal profile convex from snout to end of dorsal-fin base, nearly straight on caudal peduncle. Ventral profile gently 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 dorsal portion of head side. Snout blunt. Urogenital papilla cylindrical and short in males, pocket-shaped in females. Tip of both dorsal and anal fins pointed in males, rounded in females. Tip of dorsal and anal fins with short filamentous rays in males, the filaments reaching posteriorly to vertical through caudal-fin base. Dorsalfin rays unbranched. Caudal fin rounded. Pectoral fins elliptical. Posterior margin of each pectoral fin reaching vertical between base of 4 th and 7 th anal-fins ray in males, on vertical through anus in females. Pelvic fins short, tips reaching base of 1 st or 2 nd anal-fin ray in males and between anus and urogenital papilla in females. Pelvic-fin bases medially in close proximity. Dorsal-fin origin anterior to anal-fin origin in males, anal-fin origin on vertical betw

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

diagnosis

Diagnosis Distinguished from all other species of the subgenus Simpsonichthys, except S. zonatus, in having minute pelvic fins, with 5 rays (vs. long fins, with 6 rays in S. marginatus; pelvic fins absent in S. boitonei, S. parallelus and S. cholopteryx), and presence of vertically elongated, alternating, blue and black spots (vs. never a similar color pattern). Distinguished from S. zonatus in possessing more dorsal-fin rays (19 - 21 in males and 14 - 17 in females, vs. 15 - 17 in males and 12 - 13 in females), and dorsal-fin origin on vertical slightly anterior to anal-fin origin in males (vs. posterior to anal-fin origin).

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

distribution

Distribution Ribeirao Santana floodplains, upper rio Corumba drainage, upper rio Parana basin, central Brazil (Fig. 1).

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