Linked from
The 13 pages that link to Pachyostosis, each with the reason it gives.
FlipperRelated: Dense bones in some aquatic animals affect buoyancy and flipper use.
Cranial ornamentationRelated: Dense, thickened skull bone can produce conspicuous bosses and ridges.
SireniaRelated: Dense ribs help counter buoyancy in sirenians that feed underwater.
TylosaurusRelated: Comparisons of dense bones help reconstruct how mosasaurs controlled buoyancy.
DorudonRelated: Dense bones in some early whales helped counter buoyancy in shallow-water habitats.
Marsupial moleRelated: Dense skull bones help the mole push through loose sand.
BurnetiaRelated: Thickened cranial bones help describe the robust ornamentation seen in burnetiids.