Fig. 5.

Schematic drawing illustrating the various patterns observed in transverse sections. White, bone; black, cavities. (A) Agama atra MNHN AC 1887 881; note the typical structure in ‘double rings separated by only few trabeculae’ in the entire vertebra except the neural spine. Scale bar = 500 μm. (B) Eunectes murinus MNHN SQ-Vert 9; note the absence of cavities in the neural arch. Scale bar = 5 mm; (C) Calumma nasutum MNHN 6643F; note the restriction of cavities to the centrum. Scale bar = 200 μm.