Two new species of freshwater stingrays of the genus Paratrygon (Chondrichthyes: Potamotrygonidae) from the Orinoco basin, with comments on the taxonomy of Paratrygon aiereba

Autor(es)

Loboda, Thiago Silva ^{[1, 2]} ; Lasso, Carlos A. ^[3] ; Rosa, Ricardo de Souza ^[4] ; de Carvalho, Marcelo Rodrigues

Afiliação do(s) autor(es)

^[1] Univ Fed Acre, Ctr Ciencias Biol & Nat CCBN, Rodovia BR-364, Km 04, BR-69920900 Rio Branco, AC - Brazil

^[2] Univ Sao Paulo, Inst Biociencias IBUSP, Dept Zool, Rua Matao, Trav 14, 101, BR-05508900 Sao Paulo, SP - Brazil

^[3] Inst Invest Recursos Biol Alexander von Humboldt, Cl 28a 15-09, Bogota - Colombia

^[4] Univ Fed Paraiba, Dept Sistemat & Ecol CCEN, BR-58051900 Joao Pessoa, Paraiba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Neotropical Ichthyology; v. 19, n. 2 2021.
• Citações Web of Science: 2

Resumo

Abstract The genus Paratrygon, currently recognized as the sole monotypic genus of the family Potamotrygonidae, has a considerably greater diversity than previously indicated, including molecular studies, which supported P. aiereba (hitherto the only recognized species in the genus) as a possible species complex. Here we describe two new species of the genus that are both endemic to and sympatric in the Orinoco basin. Paratrygon aiereba, type species of the genus, is now restricted to the Amazon basin. Both new species are identified and defined through morphological characters such as coloration, dermal denticle morphology, arrangement of thorns, distribution and morphology of ventral lateral line canals, morphology of skeletal elements, and morphometrics. An extensive comparison of these characters between the new species herein described and P. aiereba is presented. Finally, a taxonomic reappraisal of P. aiereba is provided through a revision of preserved material and its original description, plus new evidence about its type-locatity, collectors, and a reconsideration of the destination of its type-specimen. (AU)

• Processo FAPESP: 11/23420-0 - Diversidade morfológica e revisão taxonômica do gênero monotípico Paratrygon Duméril, 1865 (Chondrichthyes: Myliobatiformes: Potamotrygonidae): um complexo de espécies.
• Beneficiário: Thiago Silva Loboda
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/03277-6 - Diversidade morfológica e revisão taxonômica do gênero monotípico Paratrygon Dumeril, 1865 (Chondrichthyes: Myliobatiformes: Potamotrygonidae)
• Beneficiário: Thiago Silva Loboda
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado