Abstract
Isbrueckerichthys epakmos, new species, is described from the tributaries of the rio Juquiá, rio Ribeira de Iguape basin, São Paulo State, Brazil. The new species displays a unique sexual dimorphism. Mature males are distinguished from its congeners by having a well-developed soft fleshy area and a clump of hypertrophied short odontodes directed forward or slightly upward on anterior portion of snout. It is compared with I. duseni and I. alipionis, which occurs sympatrically in the rio Ribeira de Iguape drainage. A key to the species of Isbrueckerichthys is provided.
Highlights
The rio Ribeira de Iguape basin is one of the largest coastal river basins in southeastern Brazil, being the Juquiá and São Lourenço rivers its main tributaries
In the diagnosis for the new species we present distinguishing characters that help to distinguish that species from others
A phylogenetic diagnosis for the genus Isbrueckerichthys is still lacking but species can be distinguished from all other loricariids by the combination of the following characters: small to medium size, small naked area behind the pterotic-supracleithrum, abdomen with small platelets imbedded in skin between pectoral girdle and pelvic-fin insertions, dorsal fin with one spine and, seven branched rays and caudal peduncle ovoid in cross-section
Summary
The rio Ribeira de Iguape basin is one of the largest coastal river basins in southeastern Brazil, being the Juquiá and São Lourenço rivers its main tributaries. An important ecological aspect is that this river system is totally included inside one of the largest remnants of Atlantic Forest of southeastern Brazil, where on São Paulo State alone there are nine conservation units in the form of parks and ecological stations. During ichthyological surveys lead by MCP and inventory field studies related to the MZUSP project “Fish diversity of the streams and headwaters of the rio Ribeira de Iguape in the State of São Paulo”, the upper portions of this basin were extensively sampled (Fig. 1). Loricariidae, specimens of the genus Isbrueckerichthys Derijst, 1996 were regularly collected in several small tributaries. In this paper we describe the new species, diagnose it from its congeners, and compare it to other related genera
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
