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A Taxonomic Survey of Cyst-producing Dinoflagellates from Recent Sediments of Victorian Coastal Waters, Australia

Forty-two types of cysts representing fourteen dinoflagellate genera were identified in Recent coastal sediments from Victoria, Australia. The most common were those of Scrippsiella trochoidea, Gonyaulax spinifera, Protoperidinium subinerme, Zygabikodinium lenticulatum, Polykrikos schwartzii and Protoperidinium punctulatum. Cysts belonging to the toxic dinoflagellate Gymnodinium catenation were identified in several sediment samples, constituting the first records of G. catenatüm for both Victoria and the Australian mainland, and introducing a new aspect to the regional distribution of G. catenatum. As a result of cyst incubation experiments, twenty-three cyst-theca relationships are described of which five were previously unknown (Protoperidinium cf. achromaticum, P. obtusum, Lebouraia minuta, Gyrodinium undulans and Gyrodinium impudicum).