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From: Ben Creisler firstname.lastname@example.org
Atlasaurus is NOT the same as "Cetiosaurus" mogrebiensis.
I quote from the description of Atlasaurus (pgs. 521-522):
Atlasaurus can be distinguished from each of the three
incomplete skeletons from the Middle Atlas of Morocco
considered by Lapparent (1955) as the cotypes
of "Cetiosaurus" mogrebiensis: the neural arch bases and
pleurocentra are situated in a mid-length position on
dorsal vertebrae (El Mers n. 1) whereas they are more
anterior in position in Atlasaurus; the length of the
humerus is shorter relative to that of the femur (the
ratio is 0.86 in El Mers n. 3) whereas they are equal in
length in Atlasaurus; and the lengths of the ulna and
metacarpals are longer relative to the length of the
humerus (the ratios are respectively 0.77 and 0.28 in El
Mers n. 8) than in Atlasaurus where the ratios are 0.65
and 0.24. It should be noted that the huge lunate manus
imprints from the Bathonian of the High Atlas
(Breviparopus taghbaloutensis Ishigaki 1989) are
inconsistent with the smaller size of the manus and non-
reflexed position of the first metacarpal in Atlasaurus.
At least three different sauropods were present in the
Middle Jurassic of Morocco.