Potamotrygon castexi n. sp., una nueva especie de raya de agua dulce del Río Paraná =
Subtitle: Potamotrygon castexi (Condrichthyes, Potamotrygonidae), a new species of freshwater sting-ray for the Paraná River
By: Hugo P. Castello, Daniel R. Yagolkowski.
Series: Acta scientifica ; 6
Publisher: Departamento de Zoología, ILAFIR, Universidad del Salvador
Published: 1969
Place of publication: San Miguel, Argentina
Language: spa
Number of pages: 29