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Re: Echidnas evolved from amphibious ancestors
_Monotrematum_ has "teeth and femora very similar to those of
undoubted fossil and living platypuses" (Phillips et al.)
Femora? When were femora discovered? I thought all that was known was
one lower and one upper molar?
Also, I should make explicit that mammalologists have no qualms about
referring isolated bones to isolated teeth from the same site if the
sizes appear to fit. (There was an interesting case of that at the SVP
meeting... more on that later.) There may well be two monotreme taxa
represented by that material rather than one.