As two pigmented taxa attributed to the class Chrysophyceae had been discovered (Lackey, 1939; Scagel & Stein, 1961) with apparently similar organization to the Choanoflagellida this group of protista was included in the Revised Check-list of British Marine Algae (Parke & Dixon, 1964) following Bourrelly (1957). The group was placed in the class Craspedophyceae erected by Chadefaud (1960) and a first revision of the genus and species list was included in the Check-list of British Marine Algae - Second Revision (Parke & Dixon, 1968).
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Parke et al. (1977) studied this question.
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