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Re: Earliest known Dromaeosaurid?
On Sun, 19 Nov 2000, Mickey_Mortimer wrote:
> Caleb Lewis wrote-
> What is the earliest known Dromaeosaurid? D. Antirrhopus?
> Undescribed forms known from teeth found in the Early Jurassic Hanson
> Formation of Antarctica (Ford, this list), the Bathonian of Russia
> (Novikov 1998) and England (Benton 1993), the early Kimmeridgian
> Portugal (Zinke 1998) and the Kimmeridgian-Tithonian Morrison
> Formation of Utah and Colorado (Britt 1991; Chure, Madsen and Britt
> 1993). The earliest named dromaeosaurid is Nuthetes destructor from
> the Berriasian of England.
It's important to distinguish between deinonychosaur (_Deinonychus_ <--
Neornithes) and dromaeosaurid (_Dromaeosaurus_ + _Velociraptor_). I
believe all of the forms listed above are potential Deinonychosauria, but
probably not Dromaeosauridae proper. Correct me if I am wrong.
_Deinonychus_ is indeed the earliest definite dromaeosaurid, although
_Utahraptor_ occurs slightly earlier and may very well be a dromaeosaurid.
T. MICHAEL KEESEY
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