Fig. 6 in A revaluation of rhipidocystid echinoderms based on a new flattened blastozoan from the Upper Ordovician of Maryland, USA

Fig. 6. Comparisson between the rhipidocystids Mandalacystis dockery Lewis, Sprinkle, Bailey, Moffit, and Parsley, 1987 (A), Petalocystites ikecanensis (Sprinkle, 1973) (B), Neorhipidocystis norvegica (Bockelie, 1981) (C), and Durhamicystis americana gen. et sp. nov. (D). Abbreviations: FP, flooring plate (green); M1–M9, marginal plates (yellow); O1–O7, oral plates (red); central plates (blue); stem (purple), brachioles (brown); Pe, periproct. Based on Lewis et al. 1987 (A), Sprinkle 1973 (B), and Bockelie 1981 (C).