Australosphenida

Australophenida are a clade of mammals which has nearly entirely died out. Today, living specimen exist only in Australia and New Guinea with only five surviving species species, but fossils have been in Madagascar and Argentina. Species consist of the platypus and echidnas.

This grouping includes the following animals:
 Monotremata 
 Kollikodontidae (extinct)
 Kollikodon
 Ornithorhynchidae (platypus)
 Obdurodon
 Steropodontidae (extinct)
 Steropodon
 Teinolophos
 Tachyglossidae (echidnas)

category:Monotremes