Published as part of Ubukata, Takao, Tanabe, Kazushige, Shigeta, Yasunari, Maeda, Haruyoshi & Mapes, Royal H., 2008, Piggyback whorls: A new theoretical morphologic model reveals constructional linkages among morphological characters in ammonoids, pp. 113-128 in Acta Palaeontologica Polonica 53 (1) on page 123, DOI: 10.4202/app.2008.0108, http://zenodo.org/record/13274627

Fig. 13. Results of same computer simulations as shown in Fig. 11 with an ornamented whorl shape. In order to produce an ornamented closed curve, the following parametric equations were used: x = 0.5Bcoso, y = 0.5H(sino + 0.3|sin4o|Q), where Q = H/B/5 if o Ṥ π, while Q = 5B/H if o> π. Note that simulated S values tend to be large as compared with Fig. 11F.