Impletosphaeridium severinii
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"severinii" (Cookson and Cranwell, 1967, p.208, pl.3, figs.1–2) Liengjarern et al., 1980, p.486. Holotype: Cookson and Cranwell, 1967, pl.3, fig.1. NOW Operculodinium. Originally Baltisphaeridium (Appendix A), subsequently Impletosphaeridium, thirdly (and now) Operculodinium. Age: Eocene–Oligocene.
Parent: Impletosphaeridium