Tonomochota is an extinct genus of ochotonid endemic to the Russian Far East region that is known currently from the Late Pleistocene and possibly the Early Holocene.

In 2023, Russian paleontologists Alexander E. Gusev and Mikhail P. Tiunov studied the ochotonid teeth and erected T. khinganica, named after the Greater Khingan mountain range in China.

The Sinolagomyinae was the earlier-appearing family known initially from Mongolia and China that later dispersed to Europe, Africa, and North America and lasted up to the Middle Miocene.

During the Late Miocene, newer ochotonine genera appeared in response to drier and cooler climates that led to more open environments.

[1] The Ochotoninae is defined based on specific dental traits of P3 (third lower premolar), namely a prominent anteroconid cusp that is either round or triangular in shape and opposite shallow front and back folds (paraflexid and protoflexid).

It additionally differs from Pliolagomys by its smaller size, the presence of cementum-filled folds, and the specific connection of the paraflexid and protoflexid that results in the former being deep and the latter being shallow.

[1][2] Tonomochota is exclusively known from mountain ranges of the Russian Far East during the Late Pleistocene, the fossil deposits containing it dating back to MIS 3 of the marine isotope stages.

[4] The Korydornaya Cave contains similar small mammal fauna fossils in addition to the extinct shrew genus Beremendia but additionally contains those of large mammal fossils like the sable, red fox, gray wolf, brown bear, Siberian musk deer, moose, and wild boar.