A new species of Neotropical freshwater stingray of the genus Potamotrygon Garman, 1877 from the Río Madrede Díos, Peru (Chondrichthyes: Potamotrygonidae)

Papéis Avulsos de Zoologia (São Paulo)

João Paulo C.b. Da Silva¹  Marcelo R. De Carvalho¹ 

[1] ,Universidade de São Paulo Instituto de Biociências Departamento de ZoologiaSão Paulo SP ,Brasil

关键词: Potamotrygon tatianae sp. nov.;    Potamotrygon falkneri;    Taxonomy;    Morphology;    Cryptic species;    Río Madeira;    South America;    Potamotrygon tatianae sp. nov.;    Potamotrygon falkneri;    Taxonomia;    Morfologia;    Espécies crípticas;    Río Madeira;    América do Sul;   

DOI  :  10.1590/S0031-10492011000800001

来源: SciELO

【 摘 要 】

Potamotrygon tatianae sp. nov., is described from Río Madre de Díos, Peru, upper Rio Madeira basin. The new species is distinguished from all congeners by a unique combination of characters, including its dorsal color pattern formed by a relatively slender, highly convoluted, beige to dark brown vermicular pattern, a single row of dorsal tail spines, and a relatively longer tail posterior to caudal stings. Potamotrygon tatianae sp. nov., occurs sympatrically with other species of Potamotrygon (P. falkneri, P. orbignyi and P. motoro). From the similar species P. falkneri, P. tatianae sp. nov., is further distinguished by the absence of circular, reniform, and oval spots, by its proportionally much longer tail, by having dorsal tail spines in one irregular row, and by features of the ventral lateral-line canal, dermal denticles and neurocranium. From P. orbignyi, the new species is distinct by lacking a reticulate pattern on dorsal disc and by the presence of two angular cartilages. From P. motoro, P. tatianae sp. nov., is further separated by the lack of ocelli formed by strong black concentric rings, by the more flattened aspect of its head and disc, and by having smaller and more numerous teeth. The discovery of a new species that so closely resembles a congeneric form in color pattern, a feature highly variable within the latter, highlights the importance of examining large series of individuals and of detailed morphological analyses in revealing the potentially highly cryptic nature of the diversity within the family.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License