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Re: Did non-avian dinosaurs guard nests?
At 01:18 PM 10/21/97 -0400, John Bois wrote:
>3. All (except for one) avian species tend nests. And most crocodilians
>tend nests. Can I say anything here about extant phylogenetic bracketing.
>Or can I use this statement as any kind of support?
This is a great case for the extant phylogenetic bracket. A behavior is
shared by both extant brackets (forms with very different ecologies and body
plans) and is rare among outgroups. There is a strong case that nest
attendance is a behavioral synapomorphy of Archosauria, and suggestion that
a particular extant or extinct archosaur did not practice said behavior
would require additional evidence.
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