From Academic Kids
It is unclear where Morganucodon should be classified. Sometimes it has been classified as a member of Eucynodonts (a mammal-like reptile group), and sometimes it has been classified as a primitive mammal in the subclass of Prototheria, order Doconta (extinct) or Tricodonta.
What makes Morganucodon special is that some of its upper jaw resembles that of reptiles. Inscisives are not placed in the preamaxillaria (like mammals), but in the maxillaria (like some specialized Therapsida). The lower jaw has only reptile elements. More research is needed to find out more about this species.Template:Mammal-stub