X-Nico

unusual facts about Australosphenida



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UA 8699

UA 8699 lacks a cingulid (ridge) resembling a shelf on the lingual (inner) side, indicating that is not a member of Australosphenida (the proposed clade uniting monotremes and some ancient Gondwanan mammals, including the Jurassic Madagascan Ambondro); thus, it can be identified as representing Boreosphenida, which includes marsupials, placentals, and their extinct relatives.


see also