Polysphaeridium trompetum
From dinoflaj2
"trompetum" Cookson and Eisenack, 1982, p.47, pl.4, fig.22. Holotype: Cookson and Eisenack, 1982, pl.4, fig.22. NOW Cordosphaeridium?. Originally Polysphaeridium, subsequently (and now) Cordosphaeridium?. N.I.A. Age: Paleocene.
Parent: Polysphaeridium