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Re: The Eternal Question: Lips or Skin?

Quoting Mark Hallett:

"Crocs (excluding
extinct terrestrial forms) don't have to deal with the potential dessication
of lip and mouth mucosa that other tetrapods do, since they're either in the
water or close to it. A "baretoothed" croc-like mouth in dinosaurs would be
subject to this, as well as a having a continuing problem in keeping flies
and other flying or crawling ectoparisitic forms from reaching these soft

So what about the extinct terrestrial crocodylomorphs? How do their mouths
compare to those of early dinosaurs? How about other big terrestrial
archosaurs, such as Postosuchus and their kin? Would this imply that
"lip-like coverings" had to evolve early in the history of archosaurs and
were then secondarily lost in crocodiles? I'm just throwing a lot of
questions (not necessarily well-grounded) out here. . .

Andrew A. Farke
South Dakota School of Mines and Technology
501 East St. Joseph Street
Rapid City, SD  57701