[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: AVIMIMIDS & MANIRAPTORA SENSU HOLTZ
>MANIRAPTORA SENSU HOLTZ
>Gauthier originally defined maniraptorans as 'all coelurosaurs closer to birds
>than to ornithomimosaurs'. This was because he envisioned ornithomimosaurs
>diverging first right? The subsequent lineage, crowned by avialians, would
>therefore be the Maniraptora. Right? But Dr. Holtz' more recent analysis sees
>the dromaeosaurid + avialian clade diverging before the lineage including the
>ornithomimosaurs. This now means that all post - drom + avialian coelurosaurs
>are closer to ornithomimosaurs - it would therefore create a paraphyletic
>Maniraptora if we retained Gauthier's allocations. The Holtz solution to this
>was to redefine Maniraptora as the node shared by the drom + avialian clade and
>the clade including ornithomimosaurs (therefore ornithomimosaurs and
>tyrannosaurs are maniraptorans). Right? This effectively changes the definition
>of the maniraptorans entirely and, as revealed in a recent posting, Dr. Holtz
>now plans to amend this (Maniraptora would be the clade including droms and
>avialians, the node at which maniraptorans and later coelurosaurs diverged
>now require a new name). BUT, in that definitive study, the new definition and
>allocation of the Maniraptora is stated clearly. Why must this be changed?
>people rather prefer Gauthier's original meaning of Maniraptora? Can someone
>tell me (sorry to be such a pain Dr. Holtz).
[Uh oh! He caught me!!! ;-) ]
My "redefintion" of Maniraptora Gauthier 1986 was entirely unwarrented.
Unfortunately, a few others have picked up on this (viz Clark et al. 1994).
You are quite correct - Gauthier's definition must stand. The resolution
of this problem can be found in:
Holtz, T. R., Jr. in press. The phylogenetic taxonomy of the
Coelurosauria (Dinosauria: Theropoda). Journal of Paleontology.
If the paper is not out by November, take a peak in the SVP abstracts
volume (supplement to issue 3) for a brief discussion of this.
Thomas R. Holtz, Jr. Phone: 703-648-5280
Vertebrate Paleontologist Fax: 703-648-5420
email@example.com ------------> firstname.lastname@example.org
U.S. Geological Survey -------------> University of Maryland
Branch of Paleontology & Stratigraphy ----> Department of Geology
MS 970 National Center
Reston, VA 22092 -------------> College Park, MD 20742