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Re: New paper on fish fingers

I'm still not clear on the matter of osteoderms. Irrespective of the origin of the costal plates (whether extensions of the ribs, or neomorphic ossifications), this is a separate issue from the role of osteoderms in the origin of the turtle carapace... isn't it?

No, because the costal plates are supposed to be osteoderms (at least under the pareiasaur hypothesis), osteoderms being neomorphic ossifications in the dermis.

But _Odontochelys_ has no osteoderms whatsoever.

Except the costal plates...