Mammal - Evolutionary History

Evolutionary History

For more details on this topic, see Evolution of mammals.

Cladogram following, which takes Mammalia to be the crown group.



Tritylodontidae




Adelobasileus




Sinoconodon


Mammaliaformes

Morganucodontidae

Morganucodon




Docodonta

Haldanon


Mammalia
Monotremata

Ornithorhychus (Platypus)



Tachyglossidae (Echidna)



Theriiformes

Triconodonts, Multituberculates,
Marsupials, and Placentals










Synapsida, the group which contains mammals and their extinct relatives, originated during the Pennsylvanian subperiod, when they split from the lineage that led to reptiles and birds. Crown group mammals evolved from earlier mammaliaforms during the Early Jurassic.

Read more about this topic:  Mammal

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