Apatemys chardini (Marsh 1872, Eocene, 50-33 mya) was a squirrel-lke arboreal herbivore with a massive skull. Here it nests with Trogosus derived from Tupaia, a tree shrew. It had long slender fingers, a long flexible lumbar region, and a long gracile tail.

Click here for Glires skulls compared.

Heterohyus nanus (Gervais 1848, late Eocene) from the Messel Pit in Germany nests with Apatemys in the LRT. Relatively few traits differentiate the two. The lumbar region is shorter. The skull is larger. The naris is smaller and higher on the rostrum.

Sinclairella dakotensis (Jepsen 1934, Early Oligocene, Nebraska, 35mya) is a derived member of the Apatemyidae, close to the genus Apatemys. It provides data for the dorsal skull missing in other taxa.

Gervais P 1848–52. Primates, Microchoeridae? Zoologie et Paléontologie Françaises. Paris, Arthrus Bertrand, text, 2 vols; atlas, 80 pls.

Jepsen GL 1934. A revision of the American Apatemyidae and the description of a new genus, Sinclairella, from the White River Oligocene of South Dakota. Proceedings of the American Philosophical Society 74(4): 287-305.

Marsh OC 1872. Preliminary description of new Tertiary Mammals. Parts I– IV: American Journal of Science 4: 122–128, 202–224.

Marsh OC 1872. Preliminary description of new Tertiary mammals. Part II. American Journal of Science 4(21):202-224.

Silcox MT, Bloch JI, Boyer DM and Houde P 2010. Cranial anatomy of Paleocene and Eocene Labidolemur kayi (Mammalia: Apatotheria), and the relationships of the Apatemyidae to other mammals. Zoological Journal of the Linnean Society160: 773–825.

Silcox MT, Bloch JI, Boyer DM and Houde P 2010. Cranial anatomy of Paleocene and Eocene Labidolemur kayi (Mammalia: Apatotheria), and the relationships of the Apatemyidae to other mammals. Zoological Journal of the Linnean Society160: 773–825.

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