Fig. 3 in Dimorphism in tetragonitid ammonoid Tetragonites minimus from the Upper Cretaceous in Hokkaido, Northern Japan

Fig. 3. Measurements of the conch geometries of tetragonitid ammonoid Tetragonites minimus Shigeta, 1989, from the Yezo Group in Hokkaido, Japan. A. Measured parameters on the specimens polished along the median plane. B. Measured ontogenetic changes of parameters on the specimens polished along the median plane, followed by the perpendicular plane. Abbreviations: B, whorl breadth; D, shell diameter; H1, whorl height; H2, ventral whorl height; PD, phragmocone diameter; U, umbilical width.