Apatemys revisited with DGS

Another short one today
in which the skull elements of Apatemys chardini (Marsh 1872, Eocene, Figs. 1, 2) are restored to their in vivo positions as determined by molar occlusion and jaw glenoid insertion.

Figure 1. Apatemys skull traced and reconstructed using color overlays (DGS). Yes, quite a bit of the mandible appears to be hidden beneath the broken coronoid process.

Figure 1. Apatemys skull traced and reconstructed using color overlays (DGS).

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

This taxon also gives rise to the shrew Scutisorex (check out the similar teeth, for instance), and the former tenrecs, Limnogale and Potamogale. All three are extant.

Figure 1. Apatemys, only complete fossil skeleton of an apatemyid, turns out to be a basal shrew. So this clade is not extinct.

Figure 2. Apatemys, only complete fossil skeleton of an apatemyid, turns out to be a squirrel-like  basal shrew. So this clade is not extinct.

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

wiki/Apatemyidae

 

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.