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; 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; 2.5, 2.8 - 2.10, Bothrocorbula radiatula, middle Miocene Oak Grove sand, Florida, TU 91, 2.5, 2.8, length 11.2 mm; 2.9, 2.10, length 11.7 mm. Click on image or figure number for enlargement.