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monotreme

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monotreme
a member of the animal order of Momotremata, the egg-laying mammals. Includes only two species, the duck-billed platypus and the spiny anteater.
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We know the common ancestor would have been more platypus than echidna because fossils dating back to 60 million years reveal a monotreme that was slightly larger than the modern-day platypus, but very anatomically similar," said Phillips.
Platypus and echidna diverged from same ancestor between 19 and 48 ... by Asian News International
The monotremes diverged from other primitive mammals about 166,000,000 years ago, in the late Jurassic period--a fact corroborated indirectly in the newly sequenced genome.
Platypus unlocks evolution's secrets by USA Today (Magazine)
But the platypus also lays eggs - one of only two mammals, known as monotremes, to do so.
Nature's oddball by Daily Post (Liverpool, England)
 
 
 
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