Re: hypocleidium (an interclavicle???)

["David Marjanovic" <david.marjanovic@gmx.at>]

>      And are either or both of these  homologous to the interclavicle (or
is
> that an old idea that has definitely been disproven)?

While separate clavicles occur across Dinosauria, no free interclavicle is
known for any dinosauriform, so it's safe to say the hypocleidium can't be
homologous to the interclavicle and that the loss of the interclavicle is a
synapomorphy of something like Dinosauriformes. Looking around among
nonavian theropods shows wildly different sizes of hypocleidia and sometimes
none at all.

An interclavicle was once reported for *Massospondylus*. That's a clavicle.
(ref forgotten, maybe in the archives)