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Re: Sauropod Biology
Sim Koning wrote:
There were probably specialist sauropods such as Brachiosaurus and[snip]
Dicraeosaurus. With its high shoulders, Brachiosaurus was likely a high
browser like giraffes and Indricotherium,
As with all specialists, these forms were prone to extinction, which is
probably why the Brachiosaurs died out not long after the Jurassic.
David's already mentioned _Sauroposeidon_ (Aptian), and there was also
slightly earlier post-Jurassic forms like _Pelorosaurus_. Also, although
the Brachiosauridae (sensu stricto) appears to have died out by the end of
the Early Cretaceous, the titanosauriforms as a whole thrived in the Late
Cretaceous. The 'brachiosaurs' of traditional usage comprise forms that we
know recognize as basal titanosauriforms, including (but not limited to)
true brachiosaurids (e.g., _Brachiosaurus_, _Sauroposeidon_, probably
_Pelorosaurus_, _Atlasaurus_). Complicating things further is the fact that
some titanosaurs ate grass (based on coprolite contents), which suggests
they were low grazers - at least some of the time.
Well... *Sauroposeidon*, which was bigger rather than smaller than
*Brachiosaurus*, is... how old? Aptian? That would be, like, 120 Ma...
that's 25 Ma after the end of the Jurassic... Dicraeosaurids
(*Amargasaurus*) and rebbachisaurids survived for a similar length of time.
Rebbachisaurids persisted into the Late Cretaceous. If the teeth named
_"Titanosaurus" rahiolensis_ belong to a rebbachisaurid, then the group
survived until close to the end of the Cretaceous period. (This is a big