Ischyromyidae
plural noun
Is·chy·ro·my·i·dae
| \ ˌiskə̇rōˈmīəˌdē\
Definition of Ischyromyidae
: a family of primitive extinct sciuromorph rodents widely distributed in the northern hemisphere from the Lower Eocene to the Upper Oligocene, distantly related to the mountain beaver, and distinguished by low-crowned generalized cheek teeth
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