FIGURE 31 in Systematic revision of the Potamotrygon scobina Garman, 1913 species-complex (Chondrichthyes: Myliobatiformes: Potamotrygonidae), with the description of three new freshwater stingray species from Brazil and comments on their distribution and biogeography

FIGURE 31. Skeletal anatomy (from radiographs) of Potamotrygon amazona, sp. nov. (MZUSP 117344, adult male, 532 mm DW). A. Ventral view of anterior disc and jaws. B. Angular cartilages, left side. C. Pectoral girdle, ventral view. D. Tail thorns and clasper skeleton. E. Pelvic girdle and clasper. Scale bar: 10 mm. Abbreviations: AAC, anterior angular cartilage; BCO, coracoid bar; BP, basipterigium; HYO, hyomandibula; LAC, lateral angular cartilage; MC, Meckel's cartilage; MES, mesopterygium; MET, metapterygium; MSC, mesocondyle; MTC, metacondyle; PAC, posterior angular cartilage; PIB, puboischiadic bar; PQ, palatoquadrate; PRC, procondyle; PRO, propterygium.