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The rodent subfamily Rhizomyinae includes the and certain of the . The subfamily is grouped with the Spalacinae and the Myospalacinae into a family of fossorial Muroidea basal to the Eumuroida.
The group includes 17 species classified in three genera and two tribes:
Note that the Rhizomyinae do not include two other groups which also have the common name mole rats and are also found in Africa. The closely related subfamily Spalacinae consists of mole-like rodents found in Africa and the Middle East; these are also myomorphic rodents. The family Bathyergidae, or African mole-rats (including the well-known naked mole-rat), belong to the other major division of the rodents, the hystricomorphs.
All the rhizomyines are bulky, slow-moving, burrowing animals, the Rhizomys species being the largest and stockiest. They vary in length from 150 to 480 mm (head and body) with a tail of 50 to 200 mm, and their weights are from 150 g to 4 kg, depending on the species. They mainly feed on the underground parts of plants, which they reach from foraging burrows. They are rarely active above ground, and if they do come out of their extensive burrow systems, it is at twilight or during the night. They are similar to the but lack cheek pouches. All are to some extent agricultural pests, attacking food crops, and are therefore hunted; the Asian species are eaten in the areas where they are found, while the skins of the African species are used as .
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