Mammalia - Artiodactyla - Leptomerycidae

Alternative combination: Leptomeryx defordi

Synonym: Hidrosotherium transpecoensis Wilson 1974

Full reference: J. A. Wilson. 1974. Texas Memorial Museum Bulletin 23

Belongs to Hendryomeryx according to D. R. Prothero 1996

Sister taxa: Hendryomeryx esulcatus, Hendryomeryx wilsoni

Type specimens:

• Hendryomeryx defordi: Its type locality is Big Red Horizon (Main Fossil Level), which is in a Duchesnean terrestrial horizon in the Chambers Tuff Formation of Texas
• Hidrosotherium transpecoensis:

Average measurements (in mm): M1 5.80 x 6.24, M2 6.30 x 6.94, M3 6.55 x 7.30, m1 6.07 x 4.17, m2 6.40 x 4.75, m3 9.40 x 4.70