Potamotrygon tigrina, a new species of freshwater stingray from the upper Amazon basin, closely related to Potamotrygon schroederi Fernandez-Yepez, 1958 (Chondrichthyes: Potamotrygonidae)

Autor(es)

De Carvalho, Marcelo R. ; Perez, Mark H. Sabaj ; Lovejoy, Nathan R.

• Tipo de documento: Artigo Científico
• Fonte: Zootaxa; v. N/A, n. 2827, p. 30-pg., 2011-04-21.

Resumo

A new species of Neotropical freshwater stingray, family Potamotrygonidae, is described from the Rio Nanay in the upper Rio Amazonas basin of Peru. Potamotrygon tigrina, n. sp., is easily distinguished from all congeners by its conspicuous dorsal disc coloration, composed of bright yellow to orange vermiculations strongly interwoven with a dark-brown to deep-black background. Additional features that in combination diagnose P. tigrina, n. sp., include the presence of a single angular cartilage, low and not closely grouped dorsal tail spines, and coloration of tail composed of relatively wide and alternating bands of creamy white and dark brown to black. Potamotrygon tigrina is closely related to Potamotrygon schroederi Fernandez-Yepez, 1958, which occurs in the Rio Negro (Brazil) and Rio Orinoco (Venezuela, Colombia). Both species are very similar in proportions and counts, and share features hypothesized to be derived within Potamotrygonidae, related to their specific angular cartilage morphology, distal tail color, dorsal tail-spine pattern, and ventral lateral-line system. To further substantiate the description of P. tigrina, n. sp., we provide a redescription of P. schroederi based on material from the Rio Negro (Brazil) and Rio Orinoco (Venezuela). Specimens from the two basins differ in number of vertebral centra and slightly in size and frequency of rosettes on dorsal disc, distinctions that presently do not warrant their specific separation. Potamotrygon tigrina is frequently commercialized in the international aquarium trade but virtually nothing is known of its biology or conservation status. (AU)

• Processo FAPESP: 03/01816-2 - Helmintos parasitas de potamotrygonidae:diversidade, biogeografia e co-evolucao.
• Beneficiário: Fernando Portella de Luna Marques
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 05/01299-3 - Filogenia e biogeografia dos Monogenoidea (Platyhelminthes: Cercomeromorpha) parasitos de Potamotrygonidae (Condrichthyes: Rajiformes: Myliobatoidei)
• Beneficiário: Fernando Portella de Luna Marques
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/51193-5 - Estudos sistemáticos, morfológicos e filogenéticos da família Rajidae (Chondrichthyes: Rajiformes: Rajidae)
• Beneficiário: Marcelo Rodrigues de Carvalho
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 02/06459-0 - Sistemática filogenética, evolução e classificação de raias viventes e fósseis, com uma análise da biologia histórica das raias de água doce da família Potamotrygonidae (Chondrichthyes: Batoidea)
• Beneficiário: Marcelo Rodrigues de Carvalho
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 08/09436-8 - Posicionamento filogenético e padrões de diversificação em linhagens de Rhinebothroides (Eucestoda: Tetraphillidea: Phyllobothriidae)
• Beneficiário: Fernando Portella de Luna Marques
• Modalidade de apoio: Auxílio à Pesquisa - Regular