Lyson, T.R.; Bever, G.S.; Scheyer, T.M.; Hsiang, A.Y.; Gauthier, J.A.
morphology · topology · 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.
Eunotosaurus specimens including sectioned rib NHM PV R 4949 document broadened ribs formed by successive bone deposition, but turtle-stem placement, shell homology and functional consequences are analytical rather than direct ancestral observations.
claim:event:eunotosaurus-rib-histology-shell-model