Abstract
Serrapinnus potiguar, new species, is described from the rio Ceará-Mirim, a coastal drainage in the Rio Grande do Norte State, northeastern Brazil. The new species is distinguished from the other species of the genus by the shape and arrangement of the ventral procurrent caudal-fin rays of the sexually dimorphic males; where the hypertrophied elements present the shape of a series of scimitars arranged radially, forming a semi-circle on the ventral margin of the caudal peduncle. Furthermore, the new species is diagnosed from S. heterodonand S. piaba, sympatric congeners from the northeastern Brazilian drainages, respectively by the presence of incomplete lateral line and teeth bearing at most five cusps.
Highlights
The Neotropical freshwater genus Serrapinnus includes ten species distributed on the main Cis-Andean basins of South America (Malabarba, 2003; Zarske, 2012)
The new species is assigned to the genus Serrapinnus as diagnosed by Malabarba (1998)
Mariguela et al (2013), in a phylogenetic analysis based on molecular data, proposed Serrapinnus as polyphyletic, with its species distributed among different clades in the Cheirodontinae, including genera of both tribes Cheirodontini and Compsurini, as well as incertae sedis cheirodontine genera sensu Malabarba (1998)
Summary
The Neotropical freshwater genus Serrapinnus includes ten species distributed on the main Cis-Andean basins of South America (Malabarba, 2003; Zarske, 2012). The genus, erected to host a monophyletic assemblage of cheirodontines previously assigned to the genera Cheirodon Girard, Odontostilbe Cope, and Holoshesthes Eigenmann, was diagnosed by Malabarba (1998) along with the cladistic definition of the subfamily Cheirodontinae. The species of the genus present a reduction of the number of pored scales on the lateral line, with a single exception found in S. heterodon (Eigenmann). A third species presenting the morphological synapomorphies of the genus had been previously identified by LRM for the rio Ceará-Mirim in the Rio Grande do Norte State (Dias & Fialho, 2009), and it is described
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