Hystrichosphaeridium mariannae
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"mariannae" Philippot, 1949, p.56–57; text-fig.2. Holotype: Philippot, 1949, text-fig.2. NOW Achomosphaera. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly (and now) Achomosphaera. Age: Late Cretaceous.
Parent: Hystrichosphaeridium