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pantothere

American  
[pan-tuh-theer] / ˈpæn təˌθɪər /

noun

  1. any animal of the extinct order Pantotheria that lived during the late Mesozoic Era, believed to be the ancestor of the marsupial and placental mammals.


Etymology

Origin of pantothere

< New Latin Pantotheria name of order, equivalent to panto- panto- + -theria, plural of -therium -there