Steropodontidae was a family of mammals, order Monotremata and class Mammalia of the kingdom Animalia from fossils found from the Early Cretaceous period in Australia
Class: Mammalia Monotremes (/mntrimz/, from Greek , monos ('single') and , trema ('hole'), referring to the cloaca) are one of the three main groups of living mammals, along with placentals (Eutheria) and marsupials (Metatheria). Monotremes
Temporal range: Early CretaceousRecent
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N The only surviving examples of monotremes are all indigenous to Australia and New Guinea although there is evidence that they were once more widespread including some extinct species in South America. Order: Monotremata Kingdom: Animalia The Steropodontidae was a possible family of monotremes that are known from fossils from the Cretaceous of Australia. 
