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Re: Dino sterna (was Re: Rahonavis....a Bird?....a Dino?)
>They are recovered from one _Archaeopteryx_
>(where it isn't proportionally much different in size than in other typical
>coelurosaurs), but not the others. It seems pretty clear that we aren't
>seeing multiple evolutionary origins of sterna, but instead a spotty pattern
>of ossification of this (otherwise non-ossified) structure and/or failure to
>recognize and recover the element in the field.
I'm guessing the same holds true for the furcula ("wishbone"). Norell and
Clark (1997) described a furcula in a _Velociraptor_ skeleton from
Tugrugeen Shireh, the first for any dromaeosaurid. Norell and Clark
mention that this specimen is a particularly large individual, and so
probably fully-grown. I had assumed that ossification of the furcula was
perhaps an age-related thing, with younger theropods having a purely
cartilaginous furcula (or clavicles).
I wonder, is the one _Archaeopteryx_ specimen which shows an ossified
breastplate any larger than the other specimens in body size?
Norell, M.A. and Clark, J.M. (1997). A Velociraptor wishbone. Nature 389: 447.