The elevated relative bone wall thickness of the ulna compared to other limb bones indicates a case of local pachyosteosclerosis, possibly to improve body stability in the aquatic environment.Īraripe Basin bone histology Early Cretaceous shell histology turtle The high cortical thickness of the costal plate suggests an increase of the shell stiffness. These traits indicate a late ontogenetic stage and a slow growth rate for one of the two A. The vascularisation is scarce and mainly longitudinal, also it ceases towards the bone surface, forming an avascular parallel-fibred bone with closely spaced LAGs. Inter-elemental histovariability reveals different secondary remodelling of the skeletal elements within the same individual. In this study we provide a comprehensive investigation of the microanatomical and microstructural aspects of the carapace and limb bones of the Early Cretaceous side-necked turtle, Araripemys barretoi, from the Araripe Basin, Brazil.
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