W. J. E. M. Costa & G. C. Brasil
Simpsonichthys inaequipinnatus, a new seasonal killifish from the Tocantins River basin, Brazil (Cyprinodontiformes: Rivulidae)Abstract
Simpsonichthys inaequipinnatus, new species, from the Tocantins River basin, central Brazil, is described. It is considered closely related to S. semiocellatus from the Araguaia River basin with which it shares two derived features: dorsal fin subtriangular in males, terminating as a single, long filament, and frontal squamation F-patterned. It differs from S. semiocellatus by possessing more dorsal-fin rays in males, longer dorsal-fin filament, more neuromasts in the infraorbital series, and by the absence of a black spot with blue margin on the anal fin in males.
Wilson J. E. M. Costa and Gilberto C. Brasil
Ichthyol. Explor. Freshwaters, Vol. 19, No. 3, pp. 245-248, 2008