Hypsolebias trifasciatus, a new species of annual fish (Cyprinodontiformes: Rivulidae) from the rio Preto, rio São Francisco basin, northeastern Brazil

Dalton Tavares Bressane Nielsen, Mayler Martins, Luciano Medeiros de Araujo, Fabio Origuela de Lira and Amer Faour

aqua International Journal of Ichthyology,  pp. 131-138, Volume 20 issue 3, 29 July 2014


Hypsolebias trifasciatus n. sp. is described from a temporary pool located on the left bank of the rio Preto, a tributary of the rio São Francisco. It is the first species of the H. adornatus complex recorded in a tributary rather than the rio São Francisco main channel. This species is distinguished from the remaining Hypsolebias species, with the exception of those belonging to the H. adornatus complex, by the high number of dorsal fin rays (27-28), and consequently a large dorsal fin base length, beginning considerably anteriorly to the middle of the body, before the vertical line through the pelvic fin. The new species differs from the remaining species of the H. adornatus complex by the color pattern of the anal fin, which consists in longitudinal, alternating three yellow and three black stripes (vs. stripes absent in the remaining Hypsolebias of the H. adornatus complex, or relatively inconspicuous 2 yellow stripes and 2-3 gray stripes in H. lopesi), and a unique pattern of the dorsal-fin color in males, with the presence of two groups of 3-4 irregularly-shaped, large yellow spots (vs. absence of a such pattern in the remaining Hypsolebias of the H. adornatus-group).

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