Figure 3. Landmarks used for Caryocorbula, Hexacorbula, and Bothrocorbula. Landmarks are defined as follows: (A) maximum curvature along dorsal margin of posterior adductor muscle scar; (B) intersection of pallial line with posterior adductor muscle scar; (C) posterior-most point on ventral side of rostrum; (D) posterior-most point of pallial line; (E) intersection of pallial line with anterior adductor muscle scar; (F) maximum curvature along ventral margin of anterior adductor muscle scar; (G) maximum curvature along dorsal margin of anterior adductor muscle scar; (H) dorsal-most point of cardinal tooth; (I) beak position; (J) maximum curvature of umbo; (K) maximum curvature along dorsoanterior slope; (L) maximum curvature along anterior margin; (M) maximum curvature along ventral margin; (N) maximum curvature anterior of keel along ventral margin; (O) intersection of keel with ventral margin; (P) posterior-most point on dorsal side of rostrum; (Q) intersection of keel with dorsoposterior margin.