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>Dr. Carpenter wrote:
>> They may be a uniting character for the saurischia (Theropoda +
>> Sauropoda). O.C. Marsh (1896) was the first to point them out (and
>> illustrate them) in sauropods. Later, Holland reported them from
>> Dinosaur National Monument. Naturally, von Huene illustrated them for
>> prosauropods, as has Cooper, etc. They apparently donot occur in
>> Oh, by the way. Our newly remounted Diplodocus has them (9 pairs) based
>> on a newly described sauropod from Wyoming.
>One question I've been asking myself for some time. Apart from the
>functional aspects of gastralia, what are the current hypotheses
>regarding their (phylogenetic and developmental) origin? Are gastralia
>present in other fossil or extant non-archosaurian amniotes?
Gastralia are found in many modern lepidosaurs (the gastralia of
_Sphenodon_ [under its various junior synonyms] are illustrated in most
classic studies of dinosaur gastralia).
Thomas R. Holtz, Jr.
Vertebrate Paleontologist in Exile Phone: 703-648-5280
U.S. Geological Survey FAX: 703-648-5420
Branch of Paleontology & Stratigraphy
MS 970 National Center
Reston, VA 22092