[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

New issue of Paleontology



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
---------------------------------------------------------------------