Abstract
Hasemania piatan is described from the upper rio de Contas drainage, Bahia, northeastern Brazil. It can be easily distinguished from its congeners by having 18 principal caudal-fin rays. The new species differs further from congeners by a combination of seven branched dorsal-fin rays, six branched pelvic-fin rays, anal-fin base not covered by scales, presence of only five infraorbitals, and presence of a humeral blotch. It also can be distinguished by having 10-13 branched anal-fin rays, 27-32 scales on longitudinal series, 10-12 circumpeduncular scales, and one to three maxillary teeth.
Highlights
Hasemania is a small characid genus restricted to rivers draining the Brazilian Shield
Hasemania was originally characterized by the absence of an adipose fin, presence of two rows of premaxillary teeth, absence of maxillary teeth or with a few in its upper angle, lateral line incomplete, caudal fin naked, and pectoral fin frequently archaic in small specimens
A new characid species from headwaters of rio de Contas, Bahia, Brazil counts of the holotype
Summary
Hasemania is a small characid genus restricted to rivers draining the Brazilian Shield. A recent expedition to headwaters of rio de Contas, an area poorly known ichthyologically and representing the highest point on northeastern Brazil (around 1.300 m a.s.l.), revealed a small characid, distinguishable by a series of morphological and meristic characters. We describe this new distinctive characid in Hasemania according to Ellis’ definition
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