Masillamys is an extinct genus of rodent.

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

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