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> _Euhelopus_, a camarasaurid;
> _Omeisaurus_, a shunosaurid related to _Datousaurus_;
> and _Mamenchisaurus_, between the Shunosauridae and the Diplodocidae.
> Have any of these been re-united into a larger Euhelopodidae?
All of the above, according to Paul Upchurch, as well as
_Klamelisaurus_, and _Nurosaurus_ (?spelling).
But, there's no good evidence that _Tienshanosaurus_ and
_Rhoetosaurus_ are euhelopodids. I don't know about _Chiayusaurus_.
Euhelopodids exhibit forked (or "skid-like") chevrons, like
diplodocoids. In my opinion, this evolved independently in both
groups (to protect subvertebral blood vessels when the tail was
dragged along the ground). The situation is not known for
_Euhelopus_, and I haven't seen a description yet for _Nuro_ (which,
overall, looks very similar to _Euhelopus_).
Of these, _Euhelopus_, _Nuro_, _Omei_, _Mamenchi_, and _Klameli_
comprise the "long-necked" euhelopodids. All show a pronounced
increase in both the number of cervical vertebrae and the total
number of presacral vertebrae. Diplodocids show an increase in the
number of cervicals, but only a small (if any) increase in the total
number of presacrals; extra cervicals were recruited from the dorsal
_Shuno_ and _Omei_ also have a bony tail club, and other euhelopodids
may have had them too.
Euhelopodid skulls look a bit like the skull of _Camarasaurus_
(especially that of_Euhelopus_); but, as someone else pointed out,
Upchurch found a number of persistently primitive features in the
skulls of euhelopodids.