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Another New Old Paper

Hi All -

   Another paper form ought-4 that was missed 'til now:

Yates, A. M. 2004. Anchisaurus polyzelus (Hitchcock): the smallest known sauropod dinosaur and the evolution of gigantism among sauropodomorph dinosaurs. Postilla, 230: 1-58.

A review of the type and referred specimens of _Anchisaurus polyzelus_ (Hitchcock) and _Ammosaurus major_ Marsh, from the Early Jurassic Portland Formation (Hartford Basin, Newark Supergroup), indicates that the latter is a synonym of the former. The material displays derived similarities with sauropod dinosaurs that are not present in their sister group, the prosauropods. Cladistic analyhsis strongly suports the hypothesis that _Anchisaurus polyzelus_ is the most basal known member of Sauropoda. Thus _A. polyzelus_ becomes the smallest known sauropod. Optimization of femur length using square change parsimony indicates that the lineage leading to Neosauropoda underwent gradual and sustained sisze increase for most of its history since its divergence from Theropoda. It also shows that _A polyzelus_ represents a reversal of this trend and has decreased in size relative to the sauropod common ancestor.

Available for $15 from Yale's Peabody Museum -- order form via http://www.peabody.yale.edu/scipubs/postilla_list.html.

Jerry D. Harris
Director of Paleontology
Dixie State College
Science Building
225 South 700 East
St. George, UT  84770
Phone: (435) 652-7758
Fax: (435) 656-4022
E-mail: jharris@dixie.edu
and     dinogami@hotmail.com

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