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Hystrichosphaeridium polytrichum

"Hystrichosphaeridium polytrichum" Valensi, 1947, p.818; text-fig.4.

TYPE: Holotype: Valensi, 1947, text-fig.4.

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

AGE: Late Bathonian.


Infraspecific taxa:


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