Superfamily Castoroidea: Superfamily Geomyoidea: Castorimorpha is the suborder of rodents containing the beavers, gophers and the kangaroo rats.

A 2017 study using retroposon markers indicated that they are most closely related to the Anomaluromorpha (the scaly-tailed squirrels and the springhare) and Myomorpha (mouse-like rodents).

[1] † indicates extinct taxa.

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