FIGURE 18 in Potamotrygon tigrina, a new species of freshwater stingray from the upper Amazon basin, closely related to Potamotrygon schroederi Fernandez-Yépez, 1958 (Chondrichthyes: Potamotrygonidae)

FIGURE 18. Morphological details of distal tail region in Potamotrygon schroederi, showing arrangement of dorsal tail spines, denticles, caudal stings, and vertebrae. A) AUM 44507 (adult male, 780 mm TL). B) ANSP 191999 (adult female, 605 mm TL).Published as part of De, Marcelo R., Sabaj, Mark H. & Lovejoy, Nathan R., 2011, Potamotrygon tigrina, a new species of freshwater stingray from the upper Amazon basin, closely related to Potamotrygon schroederi Fernandez-Yépez, 1958 (Chondrichthyes: Potamotrygonidae), pp. 1-30 in Zootaxa 2827 on page 24, DOI: 10.5281/zenodo.31994