FIGURE 2. Examples of suture patterns for the four ammonoid taxa considered in this paper. Figures 2.1 and 2.2 represent goniatitic patterns while Figures 2.3 and 2.4 represent ammonitic patterns. Note that sutures are not drawn to the same absolute scale. 2.1 Somoholites beluensis, MTHD 12704, Saunders (1971), figure 3B, suture figured at a shell diameter of 21 mm. 2.2 Metadimorphoceras subdivisum, SUI 35068, Manger and Quinn (1972), figure 2F, suture figured at a shell diameter of 10.2 mm. 2.3 Neogastroplites muelleri, USNM 129456, Reeside and Cobban (1960), figure 19f, suture figured at a shell diameter of 65 mm. 2.4 Coilopoceras springeri, USNM 275917, Cobban and Hook (1980), figure 11c, suture figured at a whorl height of 50 mm (roughly 80 mm shell diameter).