Figure 5 in Redescription of the skull of the Australian flatback sea turtle, Natator depressus, provides new morphological evidence for phylogenetic relationships among sea turtles (Chelonioidea)

Figure 5. Posterior view of the five genera of extant cheloniid sea turtles. Images are of surface files constructed in Avizo lite 8.0. A, Natator depressus (WAM R112123). B, Chelonia mydas (SAMA unregistered). C, Eretmochelys imbricata (WAM R120113). D, Lepidochelys olivacea (SAMA BM670). E, Caretta caretta (SAMA unregistered). Abbreviations: BO, basioccipital; EX, exoccipital; fn.po, fenestra postoticus; fr.mg, foramen magnum; fr.ner.hyp, foramen nervi hypoglossi; fs.te.su, fossa temporalis superior; OP, opsithotic; PR, prootic; PT, pterygoid; SQ, squamosal; SUP, supraoccipital. Scale bar = 50mm.