Callaiosphaeridium
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CALLAIOSPHAERIDIUM Davey and Williams, 1966b, p.103. Emendations: Duxbury, 1980, p.113; Below, 1981a, p.27. Nomenclatural junior synonym: Hexasphaera Clarke and Verdier, 1967, which has the same type. Taxonomic junior synonym: Avellodinium, according to Below (1981a, p.27) — however, Lentin and Williams (1981, p.23) retained Avellodinium. Type: Deflandre and Courteville, 1939, pl.4, fig.1, as Hystrichosphaeridium asymmetricum.
Species List: