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Re: Waders and fishers
Dann Pigdon <firstname.lastname@example.org> wrote:
> Tim Williams wrote:
> AFAIK, that's around the time that the first putative aquatic > mammals
appear (_Kollikodon_, _Steropodon_).
There's little evidence that these forms were aquatic. We've only got
two living monotreme types for comparison, but I doubt all monotremes
were platypus/echidna clones in the past.
I was not claiming that all extinct monotremes were aquatic simply because
one modern representative (the platypus) is aquatic. Nor were _Steropodon_
and _Kollikodon_ platypus "clones". Nevertheless, the original descriptions
provide evidence favoring aquatic feeding for both these monotremes. From
the Australian Museum website:
"The Cretaceous monotremes were probably similar in size and shape to the
modern platypus, although in modern monotremes the well-developed teeth of
the fossil forms are absent. _Steropodon galmani_ may have used
electroreceptors in its snout to hunt crustaceans in a similar manner to the
modern platypus. The recently discovered _Kollikodon ritchiei_ has unusual
dome-like teeth, which earned it the nickname 'hotcrossbunodon'. These
blunt, rounded molars may have been used to crush the hard shells of mussels
and other shellfish."
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