RE: Isanosaurus question

["T. Michael Keesey" <mightyodinn@yahoo.com>]

> -----Original Message-----
> From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu]On Behalf Of
> DRosent288@aol.com
> Sent: Sunday, April 14, 2002 8:00 PM
> To: dinosaur@usc.edu
> Subject: Isanosaurus question
> 
> If sauropods were already around in the late Triassic, woudn't that pretty
> much kill
> the idea that sauropods are descended from malanorosaurid prosauropods such
> as melanorosaurus or riojasaurus?

Not necessarily ... there could have been something like _Melanorosarus_ or 
_Riojasaurus_ living
before _Isanosaurus_. Absence of evidence is not evidence of absence, which is 
why stratigraphy
can be a poor indicator of phylogeny, especially for such a sparsely-known 
group.

Also quite possible (probable?) that _Sauropoda_ are descended from another 
group of "prosauropods".

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