New species of Phenacorhamdia (Siluriformes: Heptapteridae) from the Xingu River basin

Author(s)

Silva, Gabriel S. C. ; Ochoa, Luz E. ; Castro, Ithalo S.

• Document type: Journal article
• Source: Neotropical Ichthyology; v. 20, n. 2, p. 12-pg., 2022-01-01.

Abstract

Heptapteridae is a diverse group of catfishes composed of 231 valid species endemic to the Neotropical region, recognized in two subfamilies: Rhamdiinae and Heptapterinae. Phenacorhamdia is a Heptapterinae member and currently has 13 valid species broadly distributed throughout the main river basins of South America. Here we described a new species of Phenacorhamdia from the Xingu River basin. Morphological data were obtained from 30 specimens under 23 morphometric measures and 6 meristic counts. The new species differs from congeners based on the exclusive combination of the following diagnostic characters: atypical mottled colored body and all fins with interradial membranes mottled pigmented; multicuspid teeth; maxillary barbel reaching pectoral-fin origin; lacking a short extension of the first pectoral-fin ray; caudal fin lobes extremely elongated and pointed; and 43-45 total vertebrae. (AU)

• FAPESP's process: 21/12979-8 - Phylogenetic relationships among genera and families of Siluriformes using ultraconserved elements
• Grantee: Gabriel de Souza da Costa e Silva
• Support Opportunities: Scholarships in Brazil - Post-Doctoral