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Re: Re: Mongolian Strata
>1) What is the currently accepted definition of the Euhelopodidae, and
>what does it contain? Where does it lie in the dinosaur family tree.
>After reading Macintosh's article in _The Dinosauria_, I was pretty well
>convinced that the Euhelopodidae were an unnatural assemblage of Chinese
>sauropods, all of which had developed parallel adaptations for feeding at
>the tops of trees, containing:
>_Euhelopus_, a camarasaurid;
>_Omeisaurus_, a shunosaurid related to _Datousaurus_;
>and _Mamenchisaurus_, between the Shunosauridae and the Diplodocidae.
>Have any of these been re-united into a larger Euhelopodidae?
Paul Upchurch and others (including George Olzhevsky, actually, from whom I
first encountered the concept) have quite convincingly made a case for the
monophyly of the above taxa, but also include _Shunosaurus_ and possibly
_Nuerosaurus_. See Upchurch's paper in the Philosophical Transactions of
the Royal Society from September 1995 for the diagnosis. As it turns out,
_Omeisaurus_, _Euhelops_, and _Mamenchisaurus_ all lack features of the
Neosauropoda (brachiosaurids, camarasaurids, titanosauroids, and
diplodocoids), but share a variety of features independantly evolved in
Diplodocidae. All the euhelopodids may share a tail club.
Following Upchurch's phylogeny, Euhelopodidae is the sister group to
Cetiosauridae + Neosauropoda, and the phylogeny for the best known
euhelopodids is _Shunosaurus_ + (_Omeisaurus_ + (_Euhelops_ +
>2) What _is_ the big-nosed Mongolian iguanodontid?
Whatever Sergei Kurzanov and/or Dave Norman want to name it...
Thomas R. Holtz, Jr.
Vertebrate Paleontologist Webpage: http://www.geol.umd.edu
Dept. of Geology Email:firstname.lastname@example.org
University of Maryland Phone:301-405-4084
College Park, MD 20742 Fax: 301-314-9661