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Re: Dinosaurs of Morrison Formation
Just checking my mail after getting back from a week in Chicago.
Full credit to the guys at the Field Museum - the dino exhibition is
great, opening with a nice 3-D model of _Herrerasaurus_.
>DINOSAURS OF MORRISON FORMATION
Don't forget _Apatosaurus ajax_, the type species. Based on
described material, the distinction between this species and _A.
excelsus_ seems to be size - _ajax_ is bigger. I also think _ajax_
is a younger species than _excelsus_ (the type of _Brontosaurus_). I
did see a mention of a partial hindlimb bone of _excelsus_ which
would put this species in the size range of _ajax_. Future studies
may combine these two species (and kill off any chance of
resurrecting the genus _Brontosaurus_!).
After reading McIntosh's opinion of this beast in _The Dinosauria_ it
looks like a titanosaurid - six sacral vertebrae, and an ilium that
bends outward at the front.
The number of _Camarasaurus_ species is still uncertain, for much the
same reason as _Apatosaurus_.
I'm not sure what the differences are between _carnegii_ and
_longus_. I think McIntosh was the last person to study the
_Diplodocus_ species in depth, and he regarded the separation of both
species as only provisional.
Add _Diplodocus hayi_ to the list; this seems to be quite different
from the type species. _D. lacustris_ is toast.
Somebody (can't mention his name in case he's in the process of
publishing) thinks _Dystylosaurus_ is probably an invalid genus.
Don't forget _Saurophaganax maximus_, and the new _Allosaurus_
I've heard a second _Ceratsoaurus_ species is on the way. Don't have
any details, except that it's bigger(?).
A tyrannosaurid-like braincase may belong to _Stokesosaurus_ (Chure
provisionally referred it to _S. clevelandi_).
_Koparion douglassi_ and _Palaeopteryx thomsoni_, I think somebody
mentioned, and _Edmarka rex_ which could just be a large specimen of
_C. prestwichii_ is an English camptosaur, as already noted - it's
the type of _Cumnoria_.
This could be _Othnielia_.
So _S. longispinus_ may be a species of _Kentrosaurus_?