Ivanantonia is the only genus in the extinct rodent family Ivanantoniidae and is represented by a single species, Ivanantonia efremovi, from the early...

was discovered by Petr Chudinov and named after his tutor Yefremov. Ivanantonia efremovi, an Early Eocene rodent from Mongolia Kargalichthys efremovi...

some resemblances to the early rodents Ivanantonia from Asia and Nonomys from North America, but Ivanantonia has a central groove and lacks fossae, and...