Peridinium conicum (Gran, 1900) Ostenfeld and Schmidt.

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