Cleistosphaeridium williamsii
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"?williamsii" (Boltenhagen, 1977, p.41-42, pl.2, figs.6-7) Lentin and Williams, 1981, p.51. 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. Questionable assignment: Lentin and Williams (1981, p.51). Age: Cenomanian-Early Turonian.
Parent: Cleistosphaeridium
