Data from: Gradual adaptation of bone structure to aquatic lifestyle in extinct sloths from Peru

Eli Amson, Christian De Muizon, Michel Laurin, Christiane Argot, Vivian De Buffrénil & V. De Buffrenil
Non-pathological densification (osteosclerosis) and swelling (pachyostosis) of bones are the main modifications affecting the skeleton of land vertebrates (tetrapods) that returned to water. However, a precise temporal calibration of the acquisition of such adaptations is still wanting. Here, we assess the timing of such acquisition using the aquatic sloth Thalassocnus, from the Neogene of the Pisco Formation, Peru. This genus is represented by five species occurring in successive vertebrate-bearing horizons of distinct ages. It yields...
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