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Isosurface and virtual sections of a jaw and an isolated tooth of two echinorhiniform sharks. (A) Virtual section of a tooth series from the lower jaw of Echinorhinus brucus (EMRG‐Chond‐J‐19). (B–E) Virtual sections of the isolated tooth of Echinorhinus cookei (EMRG‐Chond‐T‐64) in (C) frontal, (D) sagittal and (E) axial view. The dashed line indicates where the plane of the axial tooth section lies. en, enameloid; MC, Meckel’s cartilage; or, orthodentine; os, osteodentine.
