Natural history of Mongolia

Zalambdalestes (meaning much-like-lambda robber) is an extinct genus of eutherian mammal known from the Upper Cretaceous in Mongolia.

Zalambdalestidae is a clade of Asian eutherians occurring during the Cretaceous. Once classified as Glires, features like epipubic bones and various cranial elements have identified these animals as outside of Placentalia, representing thus a specialised clade of non-placental eutherians without any living descendants, and potentially rather different from modern placentals in at least reproductive anatomy.