Willumsen, Siemensma & Suhr-Jessen 1987. A multinucleate amoeba, Parachaos zoochlorellae (Willumsen 1982) comb. nov., and a proposed division of the genus Chaos into the genera Chaos and Parachaos (Gymnamoebia, Amoebidae). Archiv fuer Protistenkunde, 134(4) 1987: 303-313