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Re: Mamenchisaurus neck

Mamenchisaurus was not a diplodocid, it was a euhelopid related to
omeisaurus, a group so far limited to Asia. As for the normal carriage of the
neck, the quarry photo (in the original 1972 publication, alas rarely
published) clearly shows the fully articulated neck flexed sharply upwards at
the base, just as in articulated camarasaurs. The rest of the neck was not
dorso-flexed, instead it curves a little convex dorsally. The individual neck
base vertebrae are beveled, again as in camarasaurs. The neck was probably
held at an angle of about 45 degrees. Deep nuchal ligaments anchored on
fairly well developed shoulder spines probably supported the neck.