Impletosphaeridium williamsii
From dinoflaj2
williamsii (Boltenhagen, 1977, p.41-42, pl.2, figs.6-7) Islam, 1993, p.87. Holotype: Boltenhagen, 1977, pl.2, fig.6; Fauconnier and Masure, 2004, pl.50, fig.6. Originally Polysphaeridium, subsequently Cleistosphaeridium, thirdly (and now) Impletosphaeridium. Age: Cenomanian-Early Turonian.
Parent: Impletosphaeridium
