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> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]
> On Behalf Of Brian Hathaway
> Sent: Wednesday, October 19, 2011 12:16 PM
> To: email@example.com
> Subject: Re: Archaeopteryx
> As of today, where does Archie stand? No longer the "first
> bird" but where is it in the family/clade world-view?
Nothing definite. The case of an Archaeopterygidae (Archie, Anchiornis,
Xiaotingia) is probably good. Whether archaeopterygids are
basal deinonychosaurs, basal avialians, or the sister group to Eumaniraptora (=
Deinonychosauria + Avialae) is far from certain.
Each position is within just a step or two from the other.
In any case, both Anchiornis and Xiaotingia are older than Archaeopteryx, so it
ain't the oldest known anything regardless of the
position of Archaeoptergyidae.
If Scansoriopterygidae is a clade within Avialae, it is likely BASAL to
> And was it a ground-nester, or is that known?
It is not known from fossils. However, tree-nesting is relatively derived
within the Aves (i.e., the modern clade of birds): most
ratites, tinamous, galliforms, and anseriforms are ground-nesters. Tree-nesting
may have arisen within Neoaves, so if Archaeopteryx
(or ANY Mesozoic bird) was a tree-nester, it would have gotten there
independantly of living tree-nesting birds.
Thomas R. Holtz, Jr.
Email: firstname.lastname@example.org Phone: 301-405-4084
Office: Centreville 1216
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
Faculty Director, Science & Global Change Program, College Park Scholars
Mailing Address: Thomas R. Holtz, Jr.
Department of Geology
Building 237, Room 1117
University of Maryland
College Park, MD 20742 USA