包括切片肋骨 NHM PV R 4949 在内的 Eunotosaurus 标本记录了由连续骨沉积形成的加宽肋骨；但其龟类干群位置、甲壳同源性和功能后果属于分析解释，而不是对直系祖先的直接观察。
claim:event:eunotosaurus-rib-histology-shell-modelEvolutionary Origin of the Turtle Shell
Lyson, T.R.; Bever, G.S.; Scheyer, T.M.; Hsiang, A.Y.; Gauthier, J.A.
年份2013
来源角色primary-study
DOI / ID10.1016/j.cub.2013.05.003
适用范围
形态 · 拓扑 · event-mechanism · range · methods
The study describes multiple Eunotosaurus specimens and histological sections, including NHM PV R 4949 and SAM K 1133; its stem-turtle placement and shell sequence are character-matrix and homology interpretations.