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David, in your recent posts, you've been saying a lot of things well.
Hang in there.
That said, I can think of one thing that would kill off all pterosaurs
virtually simultaneously, and it is the one thing that is most likely to
have occurred at the K-T boundary. Pterosaurs aren't capable of
continuous flapping flight -- they're motor-gliders. And they don't
have much in the way of fat reserves to serve as fuel tanks. If you
make weather conditions unsuitable for soaring flight for about 3 weeks,
you'll do away with all pterosaurs forever. In my mind, that's not
negative evidence. Personally, I suspect the Chixulub impactor affected
the atmosphere long enough to do exactly that. More below.
David Marjanovic wrote:
> Well said.
> Nevertheless, there is only negative evidence that suggests that the
> pterosaurs did die out catastrophically at the K-T boundary:
> http://www.cmnh.org/dinoarch/2003Jul/msg00405.html. So we better use taxa
> with a better fossil record to decide this long-decided issue.
How do we use taxa with a better fossil record to decide when pterosaurs
On the other hand, if we know when the weather screwed up, we know
exactly when they died.