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what killed choristoderes?

Does anyone have any ideas what killed off the choristoderes (champsosaurs) in the Eocene (or Oligocene?)? They certainly weren't easily killed off, since they made it through the K/T extinction (perhaps due to a similar aquatic habitat that also protected the surviving crocs).
It seems likely to me that the crocs just crowded them out, either by competition (perhaps for habitat, such as for nesting sites), or big crocs acquired a taste for choristodere eggs or young (and just ate them into extinction)?
Prey extinction or competition for prey seems an unlikely reason, unless choristoderes were more picky about what they ate. Any other plausible theories?
TGIF, Ken Kinman
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