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Ammosaurus = Anchisaurus
Adam Yates continues from an earlier publication in which he averred that
*Anchisaurus* is both a valid taxon and one of the most basal members of a
clade called Sauropoda.
Yates, A. M. in press. A revision of the problematic sauropodomorph dinosaurs
from Manchester, Connecticut and the status of *Anchisaurus* Marsh.
_Palaeontology_ (Published Online, Early View May 12, 2010:
"The taxonomic status of the sauropodomorph dinosaurs from the Newark
Supergroup of north-eastern USA is reviewed. The inclusion of the three
articulated skeletons from Wolcott's Quarry, Manchester, Connecticut in a
single species is supported. Despite claims to the contrary the Manchester
skeletons can be referred to the species *Anchisaurus polyzelus,* which is
based on a fragmentary specimen from Massachusetts. Two autapomorphies:
dorsoventrally flattened ischial blades set at a low angle to each other and
slender sacral ribs of the first sacral vertebra, link the holotype of *A.
polyzelus* to the Manchester specimens. A revised diagnosis of the species and
new skull reconstruction are presented. Recent anatomical observations of *A.
polyzelus* indicate that several character states used to assess its
phylogenetic position require revision. However, these are not sufficient to
overturn previous cladistic analyses. A revised cladistic analysis continues to
find support for *Anchisaurus* as a relatively derived basal sauropodomorph
that lies outside of the clade *Melanorosaurus* + *Sauropoda* but is more
closely related to it than to 'core prosauropods' such as *Plateosaurus* and
Jaime A. Headden
The Bite Stuff (site v2)
"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)
"Ever since man first left his cave and met a stranger with a
different language and a new way of looking at things, the human race
has had a dream: to kill him, so we don't have to learn his language or
his new way of looking at things." --- Zapp Brannigan (Beast With a Billion
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