''Masillamys'' is an extinct genus of

rodent Rodents (from Latin , 'to gnaw') are mammals of the order Rodentia (), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents. They are na ...

. It was named in 1954 by Tobien based on fossils found in the Quercy Phosphorites Formation, France. It is considered to be a

sister genus In phylogenetics, a sister group or sister taxon, also called an adelphotaxon, comprises the closest relative(s) of another given unit in an evolutionary tree. Definition The expression is most easily illustrated by a cladogram: Taxon A and t ...

to the '' Hartenbergeromys, Lophiparamys, Mattimys, Microparamys, Pantrogna, Sparnacomys'', and '' Strathcona'' genera.

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