†Simimyidae Genus †Simimys Genus †Simiacritomys Primisminthus from the middle Eocene of China could be the oldest member of the group, while Banyuesminthus, also from the middle Eocene of China, could represent a sister group to the rest of the Dipodoidea. References Dipodoid rodents Rodent taxonomy Mammal superfamilies Extant Eocene first appearances Taxa named by Gotthelf Fischer von Waldheim