FIGURE 9 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 9 | Posterior margin and tail's basis dermal denticles of Paratrygon orinocensis, MZUSP 117220 (SEM images). A. dorsal-lateral views of three dermal denticles showing the two morphological types: one more similar with the central disc dermal denticles (left down corner), and other more smiliar with thorns of tail's dorsal row (right down corner); left above a bud of a denticle. B. morphology detail of one pointed dermal denticle in lateral view. C. and D. lateral views of two dermal denticles. ccp = central coronal plate, lcp = lateral coronal ridge.