Nueva especie de Ilyodon (Cyprinodontiformes: Goodeidae) de la cuenca del río Balsas, México

Abstract

A new species of the fish genus Ilyodon is described from San Juan Tacámbaro river, Michoacán, México 19° 10′ 42″ N, 101° 20′ 45″ W. We used 129 specimens representing I. whitei, 60 of I. furcidens and 84 of the new species for our analyses. These included samples of both sexes. The new species is distinguished from I. whitei and I. furcidens by its strongly convex cephalic profile, the size and disposition of the pores of the lateral line of the preorbital, the thinner caudal peduncle, its strongly bifid tooth and the form and size of neural prezygapophyses of caudal vertebrae.