Austrolebias toba (Cyprinodontiformes: Rivulidae), una especie nueva de pez anual de la Argentina

Abstract

Austrolebias toba (Cyprinodontiformes: Rivulidae), a new species of annual fish from
Argentina. Austrolebias toba sp. n. is described from temporary ponds of the lower río Bermejo basin, in the
proximity of the mouth, from Chaco province, Argentina. This new species, is distinguished from all other
species of the genus by the following combination of characters: dorsal-fin origin anterior to anal-fin origin;
dorsal profile of head straight or slightly concave; male body green bluish with some light small dots arranged
on vertical lines on flank; very small dots light blue iridescent scattered on unpaired fins; a longitudinal stripe
light blue on upper half of dorsal fin of male; dorsal-fin base longer that anal-fin base; pectoral and pelvic fins
green bluish; median and posterior dorsal-fin rays of females longer than remainig ones forming an acute posterior
tip; round black spots on anterior and middle portion of flank of female. Additional data of the habitat and
behaviour in aquarium are added.