Steropodon
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Steropodon is a genus of prehistoric platypus-like monotreme, or egg-laying mammal. It contains a single species, Steropodon galmani, that lived about 100.2–96.6 million years ago during the Cretaceou
Steropodon galmani mandible
Steropodon BW
S. galmani holotype cast. At the AMNH.
Model at the Australian Museum, Sydney
Obdurodon
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Obdurodon is a genus of extinct platypus-like Australian monotreme which lived from the Late Oligocene to the Late Miocene. Three species have been described in the genus, the type species Obdurodon i
