ischyromyidae

\\ˌiskə̇rōˈmīəˌdē\ noun plural

Usage: capitalized

Etymology: New Latin, from Ischyromys, type genus (from Greek ischyros strong + mys mouse) + -idae; akin to Greek echein to have, hold — more at mouse

: 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