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Cleistosphaeridium williamsii

"Cleistosphaeridium? williamsii" (Boltenhagen, 1977, p.41-42, pl.2, figs.6-7) Lentin and Williams, 1981, p.51.

TYPE: Holotype: Boltenhagen, 1977, pl.2, fig.6.

HISTORY: NOW: Impletosphaeridium. Originally Polysphaeridium, subsequently Cleistosphaeridium?, thirdly (and now) Impletosphaeridium. Questionable assignment: Lentin and Williams (1981, p.51).

AGE: Cenomanian-Early Turonian.


Infraspecific taxa:


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