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Figure 1


Fig. 1. Radiograph of an anterior view of a mako shark (I. oxyrinchus) and silky shark (C. falciformis) vertebral centra with excised neural and hemal arches. Shark vertebral cartilages vary in extent and pattern of mineralization (Ridewood, 1921). I. oxyrinchus has many plates of mineralization radiating from the centrum whereas Ca. falciformis has essentially solid mineral around the perimeter of the vertebra. The lateral view of gulper shark vertebrae (Ce. granulosus) illustrates the mineralized double cone configuration.