Eusuchia Huxley, 1875

Stout, Jeremy B., Massonne, Tobias, Samuels, Joshua X. & Schubert, Blaine W., 2025, Small, enigmatic alligatoroid from the Middle Eocene Clarno Formation, John Day Fossil Beds, Oregon, Fossil Record 28 (2), pp. 309-319 : 309-319

Eusuchia Huxley, 1875

Type species.

Indeterminate.

Referred specimen.

UCMP 164866 , right humerus.

Description.

UCMP 164866 is a right humerus from the Hancock Mammal Quarry that represents the only crocodylian postcranial element recovered from the upper section of the Clarno Formation (Fig. 4 ). It measures 10.5 cm in straight-line length. The proximally projecting deltopectoral crest offers some phylogenetic information ( Brochu 1999), but it is not preserved in UCMP 164866 . It is figured herein only as representative eusuchian postcranial material and is not assumed to be associated with the taxon or individual of UCMP 164865 , though the relative size of each does not negate the possibility.

Figures

Figure 4. UCMP 164866, crocodylian right humerus from the Eocene age Hancock Mammal Quarry (Clarno Formation, John Day Fossil Beds National Monument) in posterior (top), anterior (middle) and lateral (bottom) views. Dashed line shows the approximate extent and orientation of the deltopectoral (dp) crest. Scale bar: 1 cm.