Steropodontidae was a family of mammals, order Monotremata and class Mammalia of the kingdom Animalia.
Kingdom: Animalia Order: Monotremata 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). The Steropodontidae was a possible family of monotremes that are known from fossils from the Cretaceous of Australia. There are two genera placed in this family: Steropodon and Teinolophos, which have been tentatively placed in the family due to the similarity of the lower molars in these two genera. However, the latter may be more basal. 
