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Re: Revising Hou et al, 96 (very very long)
Tim Williams wrote-
> > That's how I feel about the characters shared by Sinornithosaurus and
> > dromaeosaurids (T-shaped quadratojugal, elongated distal caudal
> > chevrons and prezygopophyses and some others).
> And secondarily lost in birds, including basal forms (like
> Why would birds lose a stiffened tail so early in their evolution?
Yup. Why would birds lose the mid-dorsal ischial process? Who knows? Why
not invoke Paul's idea that structures are easier to lose soon after they
> > That's Lourinhanosaurus. Syntarsus, Poekilopleuron and those new
> > ornithomimids have them too.
> Got a ref for _Syntarsus_ gastroliths?
Matora pers. comm. to Whittle and Everhart (1989), in Whittle and Everhart's
2000 gastrolith paper in the Dinosaurs of New Mexico volume.