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Hystrichosphaeridium difficile

"Hystrichosphaeridium difficile" Manum and Cookson, 1964, p.12-14, pl.3, figs.1-3,7.

TYPE: Holotype: Manum and Cookson, 1964, pl.3, fig.1.

HISTORY: NOW: Heterosphaeridium. Originally Hystrichosphaeridium, subsequently Cordosphaeridium? (combination not validly published), thirdly (and now) Heterosphaeridium.

AGE: Cenomanian.


Infraspecific taxa:


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