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Re: Sauropod Biology

Sim Koning wrote:

My point was simply that the extremely derived, high shouldered forms seemed to have gone into decline after the Jurassic.

Yes, that seems to be true. In that vein, Cifelli et al. (2000) gave _Sauroposeidon_ the species name _proteles_, meaning "perfected before the end".

There is some evidence that they may have survived into the late cretaceous though.

Carpenter and Tidwell (2004) suggest that the brachiosaurid _Sonorasaurus_ might be of Cenomanian age. Anatomically, _Sonorasaurus_ is extremely similar to _Brachiosaurus_.