RE: Dromiceiomimus diagnosis request

["Thomas R. Holtz, Jr." <tholtz@geol.umd.edu>]

> From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu]On Behalf Of
> Matias Soto
>
> > > Can someone help me to find the diagnosis of the ornithomimids
> Dromiceiomimus and Ornithomimus on the web? Or someone
> > > have them on pdf?
>
> This remind me something. Lawrence Lambe (1902) figured a tooth (an incisor)
> who was assigned by the author to *Ornithomimus altus*, given the frequent
> association between these type of teeth and *Ornithomimus* skeletal
> material. Later, being *Ornithomimus* recognized as an edentulous theropod,
> F. von Huene suggested that it belonged to *Struthiomimus*.
>
> IMHO, the specimen is a premaxillary tooth from a tyrannosaurid. I have a
> picture, if someone is interested.

I'd like to see a picture.

> Do any of you know when this type of teeth were recognized as belonging to
> non-ornithomimid theropods? I would appreciate any comment.

Probably about the time that the first good tyrannosaurid skulls were described 
(1912 for Tyrannosaurus, 1914 for Gorgosaurus).
Incisiform tyrannosaurid premaxillary teeth had been known since the mid-1800s, 
but there particular affinity was uncertain for many
decades (Marsh, for instance, thought they came from some otherwise unknown 
large Cretaceous mammal).

                Thomas R. Holtz, Jr.
                Vertebrate Paleontologist
Department of Geology           Director, Earth, Life & Time Program
University of Maryland          College Park Scholars
        Mailing Address:
                Building 237, Room 1117
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http://www.geol.umd.edu/~tholtz/
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