Paracimexomys Group
Lambert M. Surhone, Mariam T. Tennoe, Susan F. Henssonow
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The Paracimexomys group is a loose grade of extinct mammals which are known from the Lower Cretaceous and possibly through to the Paleocene of North America.
They were members of an also extinct order called Multituberculata.
These were generally small, somewhat rodent-like creatures, some of whom shared the world with dinosaurs.
As remains are rather sparse, it's not yet been possible to define this group with more certainty.