Fig. 4 in Shell bone histology of solemydid turtles (stem Testudines): palaeoecological implications

Fig. 4 Thin-sections of Solemydidae aff. Helochelydra sp. a External cortex and interior cancellous bone of costal (MNCN 59503) in normal transmitted light. b Cancellous bone and external cortex of peripheral (MNCN 59503). c Internal cortex of plastral fragment (hyo- or hypoplastron, MNCN 59503) in normal transmitted (left) and crosspolarized light (right). Note that image c is facing upside-down due to technical constraints. Abbreviations: CB cancellous bone; ECO external cortex; ICO internal cortex; ISF interwoven structural fibres; PFB parallel-fibred bone