Re: Cetiosaurus question

["Alessandro Marisa" <amaris@tin.it>]

----- Original Message -----
From: "Justin Tweet" <thescelosaurus@juno.com>
To: <dinosaur@usc.edu>
Sent: Wednesday, January 16, 2002 6:39 PM
Subject: Re: Cetiosaurus question


> I think that the figure may actually be *Atlasaurus* (the material of
> which had been referred to *C. mogrebiensis* at the
> time)

I don't think that Atlasaurus imelakei and Cetiosaurus mogrebiensis are the
same animals, infact in the description of Atlasaurus the author write: "In
middle Jurassic strata in Morocco, at least three major taxa of Sauropods
are present: Atlasaurus imelakei, Cetiosaurus mogrebiensis, a giant Sauropod
indicated by a trackway, and the longest Sauropods femur (2360mm)".
Furthermore, Cetiosaurus mogrebiensis can be distinguished by Atlasaurus
imelakei in that the neural arch bases and pleurocentra are situated in a
mid-length position on dorsal vertebrae, whereas they are more anterior in
position in Atlasaurus imelakei; the length of the humerus is shorter
relative to that of the femur (humerus/femur ratio = 0.86) whereas they are
equal in length in Atlasaurus imelakei; and the length of the ulna and
metacarpals are longer  relative to the length of the humerus (the ratios
are respectively 0.77 and 0.28) than in Atlasaurus imelakei where the ratios
are 0.65 and 0.24.

By
____________________________________________
Marisa Alessandro
"Volounteer of Museo Paleontologico Cittadino, Monfalcone"
Via Achille Grandi n°18
38068 ROVERETO (TN) ITALY
Tel:039-0464-434658 Email amaris@tin.it
Museum Web-Page: http://www.fante.speleo.it
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