Fig 1. Comparative morphometrics of Maastrichtian, Danian and Recent lamniform teeth.
Thirteen variables were analysed: seven characters were measured directly (A-G), from which five other variables were calculated, and the presence of small (1) or large (2) serrations were recorded. CD = direct cusp height, CI = indirect cusp height, HW = half-cusp width, BW = base cusp width, BD = base depth, HD = depth at half-cusp height, LH = height of largest lateral cusplet. M = Maastrichtian, D = Danian, R = Recent. Fossil teeth were disarticulated, Recent teeth were measured in situ within jaws (differentiated by grey shading). Italics indicate the number of teeth with complete, measureable characters in each subset.