Potamotrygon marquesi, a new species of neotropical freshwater stingray (Potamotrygonidae) from the Brazilian Amazon Basin

Autor(es)

Capretz Batista da Silva, Joao Paulo ^[1] ; Loboda, Thiago Silva ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Biociencias, Dept Zool, Lab Ictiol, Rua Matao, Trav 14, n101, BR-05508090 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Lab Paleontol, Dept Biol, Fac Filosofia Ciencias & Letras Ribeirao Preto, Ribeirao Preto - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Fish Biology; v. 95, n. 2, p. 594-612, AUG 2019.
• Citações Web of Science: 2

Resumo

Potamotrygon marquesi, sp. nov., is described and compared with other species of Potamotrygon occurring in the Amazon Basin. The identity of this new species is supported by an extensive external and internal morphological study including coloration pattern, squamation, skeleton and ventral lateral-line canals. Morphometrics and meristics were used to further distinguish P. marquesi from congeners. Potamotrygon marquesi was first considered to fall within the range of variation found in P. motoro. However, even with an extensive variation in coloration observed in P. motoro, this new species presents a series of autapomorphies that confidently distinguishes it from what is understood as the morphological variation found in P. motoro. Additional morphological characters that diagnose P. marquesi include three angular cartilages, asymmetrical star-shaped denticles, a single regular row of spines on tail dorsum, lateral row of caudal spines near the sting insertion, dorsal disc background in beige and grey mixed with shades of grey and bearing open and closed bicolored rings, among others. Although presenting a gap of distribution along the west-east extension of the Amazon Basin, its diagnostic charactistics are consistent in both recorded regions. Our study supports the need for many morphological characters to robustly distinguish members of Potamotrygoninae considering their extremely variable dorsal disc color pattern. (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: 10/52677-6 - Filogenia dos principais grupos de chondrichthyes baseada na anatomia comparada do esqueleto das nadadeiras e suas cinturas.
• Beneficiário: João Paulo Capretz Batista da Silva
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 07/52193-6 - Revisão taxonômica e morfológica do complexo Potamotrygon orbignyi (Castelnau, 1855) (Chondrichthyes: Myliobatoformes): Potamotrygonidae
• Beneficiário: João Paulo Capretz Batista da Silva
• Modalidade de apoio: Bolsas no Brasil - Mestrado