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Re: New issue of Paleontology

COMMENT: I would be keenly interested in the opinions
of Jeff Wilson and Matthew Bonnan on the sauropod
paper. Jeff Wilson, in particular, has, after
exhaustive analyses, found nothing diagnostic about
   Re: the Chure/Alain effort to rescue Poecilopleuron
bucklandii and to bury Megalosaurus bucklandii: the
effort is a surprise, considering R. Alain's
indebtedness to Sam Welles's thorough osteological
comparisons of all of the hypodigms. I have Sam's
length description (albeit based on the 1838 mss.) of
the French taxon, to be sure, appearing in my
in-progress Mutanda Dinosaurologica (where
Megalosaurus is a senior synonymn of Poecilopleuron
(and its variant spellings)and Dan Chure's new
Allosaurus sp. is, after some thought, is synonymized
into A. fragilis. I, for one, would very much like to
peruse R. Alain's Ph.D. dissertation, examine his data
bases, as these have not been forthcoming from such a
careful scholar.
--- Alessandro Marisa <amaris@tin.it> wrote:
> Dear ListMember for the Sauropods and Theropods fun
> in the new issue of
> "Paleontology" (Vol.45 issue 6 November 2002)
> there're two Dinosaur paper of
> interest:
> 1_ Upchurch P. and Martin J. 2002 The Rutland
> Cetiosaurus: the anatomy and
> relationships of a Middle British sauropod dinosaur.
> follow the abstract:
> Upchurch and Martin described a relatively
> well-preserved specimen of
> Cetiosaurus oxoniensis, from the Middle Jurassic
> (Bajocian) of Rutland,
> United Kingdom. The material includes a nearly
> complete cervical series,
> representative dorsal vertebrae, a fragment of
> sacrum, anterior caudals, the
> right femur, and numerous rib and limb fragments.
> Contrary to previous
> suggestions that this specimen possesses 14 cervical
> and ten dorsal
> vertebrae, it seems more probable that there were at
> most 13 cervicals and
> at least 12 dorsals. The vertebral column displays
> several autapomorphic
> features which supplement the generic diagnosis of
> Cetiosaurus, including:
> (1) a stout, anteriorly directed process located at
> the top of the neural
> spine of the twelfth (?) cervical vertebra; and (2)
> the presence of lateral
> pits, separated by a thin midline septum, below the
> transverse processes of
> middle dorsal vertebrae. The cladistic analysis by
> Upchurch and Martin
> indicates that Cetiosaurus is probably the
> sister-taxon to the advanced
> neosauropod clade. This relationship affects the
> distribution of particular
> character states that have played an important role
> in determining sauropod
> phylogeny.
> 2_Allain R. and Chure D.J. 2002 Poekilopleuron
> buchlandi, the theropod
> dinosaur from the Middle Jurassic (Bathonian) of
> Normandy.
> Follow the abstract:
> Poekilopleuron bucklandii, described by
> Eudes-Deslongchamps in 1838, is one
> of the earliest discovered dinosaurs. Although
> incomplete, it is one of the
> best preserved Middle Jurassic theropods known from
> Europe. Unfortunately,
> the only specimen of P. bucklandii, housed in the
> Musée de la Faculté des
> Sciences de Caen, was destroyed during World War II.
> However, casts of some
> parts of the type skeleton have been found in the
> collections of the Museum
> National d'Histoire Naturelle, Paris. Allain and
> Chure use this casts and
> Eudes-Deslongchamps' monograph to redescribe the
> specimen. They found that
> Poekilopleuron shares one synapomorphy with the
> Spinosauroidea and
> tentatively assign it to that clade. Allain and
> Chure examine also the
> synonymy between Poekilopleuron and Megalosaurus and
> conclude that
> Megalosaurus is a nomen dubium and that the name
> should be restricted to the
> type dentary.
> By
> Alessandro Marisa
> Via Achille Grandi n°18
> Rovereto (TN) ITALY
> Tel: 039-0464-434658 Email: amaris@tin.it

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