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Rahonavis (was Re: Ornithoms, Parrots, and others)
At 03:14 PM 11/12/98 EST, Dinogeorge wrote:
>I do believe we have a volant deinonychosaurian in the fossil record of
>Madagascar: _Rahonavis_. The problem is to establish that it is on the other
>side of the phylogenetic bracket, which is difficult because (1) the remains
>are incomplete and (2) it underwent a lot of evolution itself since diverging
>from the common ancestor of deinonychosaurians and birds.
I suspected that _Rahonavis_ would fall out as a deinonychosaur in my latest
phylogeny, but in my latest runs it comes out as a basal avialian (closer to
birds than to dromaeosaurs). However, as it is so fragmentary, and as the
newer specimens of dromaeosaurids from both the Cloverly and Mongolia are
showing a wider ranger of morphologies within that taxon, I wouldn't be
terribly surprised if it didn't make the hop over to the dromaeo-side of things.
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