Figure 2. Illustrations of Caryocorbula, Bothrocorbula, and Hexacorbula valves, all X4. 2.1, 2.2, 2.11, 2.12, Hexacorbula hexacyma, middle-upper Miocene Gatun Formation, Panama, TU 1342, 2.1, 2.11, length 23.0 mm, 2.2, 2.12, length 18.6 mm.