Trichechus manatus bakerorum Domning, 2005

Bell, Christopher J., Godwin, William, Jenkins, Kelsey M. & Lewis, Patrick J., 2020, First fossil manatees in Texas, USA: Trichechus manatus bakerorum from Pleistocene beach deposits along the Gulf of Mexico, Palaeontologia Electronica (a 47) 23 (3), pp. 1-16 : 7

Trichechus manatus bakerorum Domning, 2005

( Figure 6 )

SHSU 1-235. Mandibular symphysis, with partial left dentary ramus preserving alveoli for two teeth. The symphyseal region has a relatively shallow dorsoventral depth. The ventral surface is abraded on the left side, but the preserved portion of the right side includes a low, rounded, ventrally projecting boss. The low projection and shallow depth of the mandible at the symphysis are apomorphic and diagnostic of Trichechus manatus bakerorum ( Domning, 2005) . Depth at the symphyseal line is 4.1 cm; width across the symphysis is 5.2 cm. From the Joe Liggio collection.

Figures

FIGURE 6. SHSU 1-235, mandibular symphysis with partial left dentary ramus in dorsal (A), ventral (B), and anterior (C) views. The shallow dorsoventral depth and low, rounded ventrally projecting boss (arrow) are diagnostic features of the extinct morphotype Trichechus manatus bakerorum. Scale bar equals 2 cm.