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Re: Platypuses may be older than we think...
The divergence between the platypus and echidna lineages undoubtedly
pre-dates the divergence between any two crown-group placental orders.
Given just how distinct the two modern monotreme lineages are,
Surely the same must hold for cows and dolphins...?
the names Platypoda and Tachyglossa might turn out to be useful for future