Figure 2. Illustrations of Caryocorbula, Bothrocorbula, and Hexacorbula valves, all X4. 2.3, 2.4, 2.6, 2.7 Caryocorbula prenasuta, middle-upper Miocene Gatun Formation, Panama, NMB 18322, 2.3, 2.7, length 13.3 mm, 2.4, 2.6, length 11.9 mm.