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Re: earliest herbivore
The 1818 discovery of anchisaurs is kind of funny (from Norman, p74-75):
...The earliest discovery of anchisaurus was made in 1818. These fragmentary
remains, at first thought to be human, were not confidently identified as
reptilian until 1855! And it was not until 1912, when Richard Swan Lull was
reviewing the fossils found in the Connecticut Valley, that the material was
referred to as those of the prosauropod dinosaur Anchisaurus. Between the
time of the first discovery and its final identification, other material was
discovered in adjoining areas of the Connecticut Valley. Edward
Hitchcock...reported bones [which were] named megadactylus polyzelus by his
son...E. Hitchcock Junior and subsequently renamed amphisaurus by Marsh in
1882 (because another animal had already been named megadactylus), and then
again in 1885 renamed anchisaurus polyzelus by mMarsh because the name
Amphisaurus was already preoccupied!
The most productive site in the Connecticut Valley proved to be a quarry near
Manchester, Connecticut, this produced three well-preserved prosauropod
skeletons and a few other fragments. These skeletons were described in some
detail by O. C. Marsh in ther early 1880s as anchisaurus major, A. colurus and
A. solus. A. major was renamed Ammosaurus major and A. colurus became
Yaleosaurus colurus just to add to the general confusion!
>From this I conclude that yes, there is a Yaleosaurus.