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Re: Endothermic Crocs in Nature
On 4/15/05, Tim Williams <email@example.com> wrote:
> David Peters wrote:
> >As Greg Paul has noted earlier, apparently the easiest
> >time for a taxon to revert is when it is only a few steps into the next
> Greg cites this in support of "neoflightlessness" in early birds. This
> "rule" makes a great deal of intuitive sense; but I have yet to see any hard
> evidence (e.g., similar reversions of incipient or nascent ecomorphologies
> in other lineages). For example, I know of no "neoflightless" insects, nor
> "neoamphibious" proto-cetaceans.
"Easier" doesn't mean "necessary". The thing to do would be to find a
clades where reversals *do* happen, and then determine if the
reversals tend to happen more often closer to the root.