Fig. 17From: Dienerian (Early Triassic) ammonoids from the Candelaria Hills (Nevada, USA) and their significance for palaeobiogeography and palaeoceanographyScatter diagrams of H, W, and U (left), and of H/D, W/D, and U/D (right) for Proptychites haydeni (Krafft, 1909). Solid symbols represent the pathologic specimen figured in Fig. 21-2. D diameter, H whorl height, U umbilical diameter, W whorl widthBack to article page