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Hystrichosphaeridium heteracanthum

"Hystrichosphaeridium heteracanthum" Deflandre and Cookson, 1955, p.276, pl.2, figs.5-6; text-figs.40-41.

TYPE: Holotype: Deflandre and Cookson, 1955, pl.2, fig.5.

HISTORY: NOW: Heterosphaeridium?. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium, fourthly Heterosphaeridium, fifthly (and now) Heterosphaeridium?.

AGE: ?Late Cretaceous-Early Eocene.


Infraspecific taxa:


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