Pantotheria

plural noun

Pan·​to·​the·​ria

ˌpantəˈthirēə

: an order or other division of generalized mammals widespread during the Jurassic and commonly conceded to be ancestral to the marsupials and placental mammals

pantotherian

¦⸗⸗¦thirēən

adjective or noun

Word History

Etymology

New Latin, from panto- + -theria

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