Reference

J. Popovsky, L.A. Pfiester (1982): The Life-histories of Stylodinium sphaera Pascher and Gystodinedria inermis (Geitler) Pascher (Dinophyceae), Two Freshwater Facultative Predator-autotrophs – Archiv für Protistenkunde – 125_1982: 115 - 127.