Peridinium divergens var. conicum Gran, 1900

Now Protoperidinium conicum. Originally Peridinium divergens var. conicum, subsequently Peridinium conicum, thirdly (and now) Protoperidinium conicum.
Modern taxon defined from the motile stage. Fossil cysts assigned to this taxon by Deflandre, 1939 were included in Palaeoperidinium deflandrei Lentin and Williams, 1973, by Lentin and Williams, 1973.
Holotype: unknown (to present authors)
Age: Recent