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More Sauroposeidon material from Texas



From: Ben Creisler
bcreisler@gmail.com

A new online paper:

D. A. Winkler, M. J. Polcyn and L. L. Jacobs (2013)
New sauropod dinosaur material from Jones Ranch: a large Comanchean
nonmammalian tetrapod from Texas.
Earth and Environmental Science Transactions of the Royal Society of
Edinburgh  (advance online publication)
DOI: http://dx.doi.org/10.1017/S1755691013000418
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=9015871&fulltextType=RA&fileId=S1755691013000418

New sauropod dinosaur material is described from Jones Ranch, Early
Cretaceous of Texas (USA). Originally described as Paluxysaurus
jonesi, the material from Jones Ranch has recently been referred to
Sauroposeidon proteles. Elements newly prepared from dense
concretionary matrix include the sacrum, ilium and proximal portion of
the tail. Reconstructions of the skull and sacrum plus pelvic girdles
are presented. ‘Paluxysaurus jonesi’ (=S. proteles) is a blunt-faced
sauropod that was originally regarded as closely related to
Brachiosaurus. Portions of the sacrum are now exposed and show that it
is nearly complete, missing only parts of the first sacral (S1). The
anterior sacrals are firmly fused, however, a newly discovered
opisthocoelous last sacral (S6) remains unfused. A complete sequence
of proximal caudal vertebrae shows a rapid transition from
anteroposteriorly short and mediolaterally broad centra anteriorly, to
more elongate cylindrical centra posteriorly. All proximal caudals
have slightly amphicoelous centra. Some middle anterior caudals have a
shallow longitudinal groove on the ventral surface of the centrum.
Specimens from Jones Ranch exhibit characters of the sacrum and tail
that clearly corroborate placement of ‘P. jonesi’ (Sauroposeidon
proteles) as a somphospondylan titanosauriform.