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What're Rebbachisaurids? (was - New Nemegtosaurus paper)

From: Tim Williams <twilliams_alpha@hotmail.com>
Reply-To: twilliams_alpha@hotmail.com
To: Subject: New Nemegtosaurus paper
Date: Thu, 25 Aug 2005 12:18:44 -0500

Wilson (2004) also notes that titanosaurs and rebbachisaurids appear to be the only two sauropod clades that flourished in the Cretaceous. Although other groups (brachiosaurids, dicraeosaurids, basal diplodocoids) survived into the Cretaceous "they did not appear to diversify".

out of curiosity, what're the Rebbachisaurids like?

(were they armor-plated like the Titanosaurs?)

and, there may not be a solid answer for this, but I'll ask anyway - why didn't Brachiosaurids, Dicraeosaurids, and Diplodocoids diversify?