FIGURE 22 in Two new species of freshwater stingrays of the genus Paratrygon (Chondrichthyes: Potamotrygonidae) from the Orinoco basin, with comments on the taxonomy of Paratrygon aiereba

FIGURE 22 | Dermal denticles on the dorsal disc and tail of Paratrygon parvaspina, IAvH-P 12447 (holotype). A. distribution of dermal denticles. B. detail of some thorns with tubercular base on the posterior margin of the disc and tail's basis. C. detail of basal plates of these tubercular spines. bp = basal plate.