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- adj. Relating to pachyostosis
Sorry, no etymologies found.
I think that until they evolve that ability, marine mammals are compelled to have pachyostotic skeletons to overcome their lung buoyancy.
Manatees float and they are pachyostotic, and many whales are deep divers and have very porous bones.
The small, short-necked plesiosaur near the sea floor is the pachyostotic pliosaurid Pachycostasaurus, described by Cruickshank et al. (1996).