A-E, Callorhinchus milii, adult, A-E.

A, 3D volume rendering (Aviso), anterior view. Asterisk indicates comparable region in 7E. B, 3D volume rendering, lateral view (Drishti), arrow indicates anterior. False color differences indicate surficial mineralization (yellow) and unmineralized cartilage (brown). Levels of Fig 7C and 7E indicated. Note that mineralization proceeds internally via the spinal nerve foramina (C, virtual section, Drishti). D, virtual section (Drishti) showing pairs of spinal foramina anteriorly, continuous foramina posterior. Arrowhead indicates region in Fig 7E, arrow indicates ventral area where vertebral elements have not fully fused or coalesced. E, virtual section (Drishti) through ventral part of synarcual showing unfused elements (arrowheads) that have become mineralized, preventing further fusion and preserving a portion of the original shape.