Relation To Other Rodents
Geomyoids have been considered to be either sciuromorphous or myomorphous depending on the authority. The masseter muscle does not pass through the infraorbital canal; it cannot due to the position of the canal. Some authorities consider the geomyoids related to squirrels, beavers, and mountain beavers on this basis.
The masseter muscle does attach directly behind the zygomatic arch in a manner very different from sciuromorphs. Some authorities consider geomyoids myomorphs based on this feature. This suggests they may be related to mice, jerboas, and perhaps dormice.
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