Filikomys is an extinct genus of mammal from the Campanian of North America. A multituberculate, it demonstrates complex social behaviours were present in these early mammals.Weaver, Lucas N.; Varricchio, David J.; Sargis, Eric J.; Chen, Meng; Freimuth, William J.; Wilson Mantilla, Gregory P. (2 November 2020). "Early mammalian social behaviour revealed by multituberculates from a dinosaur nesting site". Nature Ecology & Evolution. 5 (1): 32–37. doi:10.1038/s41559-020-01325-8. PMID 33139921. S2CID 226241443. The type species is F. primaevus; a second, smaller species, F. minor, has been tentatively assigned to the genus.
Description Filikomys primaevus is a roughly squirrel sized mammal. Several individuals were found within the same locale. The holotype is a dentary, NMC 1890.
Etymology From Greek Filikós "friendly", and mys, mouse, alluding to its social behaviour. Primaevus is Latin for youthful.
Classification Filikomys primaevus is nested among the Ptilodontoidea.
Social behaviour Several individuals were found co-habitating a burrow. This suggests multituberculates had complex social behaviours like modern mammals, which in particular have been compared to the social complexity of placentals.
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