Callaiosphaeridium

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.

Parent: Family Gonyaulacaceae Subfamily uncertain

Species List:

*Callaiosphaeridium asymmetricum
"Callaiosphaeridium falsificum"
Callaiosphaeridium scabratum
Callaiosphaeridium trycherium