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.

A Platypus

This grouping includes the following animals:

• Monotremata
  • Kollikodontidae (extinct)
    • Kollikodon
  • Ornithorhynchidae (platypus)
    • Obdurodon
  • Steropodontidae (extinct)
    • Steropodon
    • Teinolophos
  • Tachyglossidae (echidnas)