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Heterosphaeridium heteracanthum

Heterosphaeridium? heteracanthum (Deflandre and Cookson, 1955, p.276, pl.2, figs.5-6; text-figs.40-41) Eisenack and Kjellström, 1972, p.451.

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

HISTORY: Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium, fourthly Heterosphaeridium, fifthly (and now) Heterosphaeridium?. Questionable assignment: Stover and Evitt (1978, p.52).

AGE: ?Late Cretaceous-Early Eocene.


Infraspecific taxa:


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