Polysphaeridium williamsii
From dinoflaj2
"williamsii" Boltenhagen, 1977, p.41-42, pl.2, figs.6-7. Holotype: Boltenhagen, 1977, pl.2, fig.6; Fauconnier and Masure, 2004, pl.50, fig.6. NOW Impletosphaeridium. Originally Polysphaeridium, subsequently Cleistosphaeridium?, thirdly (and now) Impletosphaeridium. Age: Cenomanian-Early Turonian.
Parent: Polysphaeridium
