Palaeoperidinium pyramidale
From dinoflaj2
"pyramidale" (Harris, 1974, p.163, pl.1, figs.5-11) Lentin and Williams, 1976, p.111. Holotype: Harris, 1974, pl.1, fig.5. NOW Morkallacysta. Originally (and now) Morkallacysta, subsequently Palaeoperidinium. Age: Paleocene.
Parent: Palaeoperidinium