Operculodinium operculatum
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operculatum (Sah et al., 1970, p.144, pl.1, figs.1-2) Jain, 1982, p.51. Holotype: Sah et al., 1970, pl.1, fig.1. Originally Achomosphaera, subsequently Achomosphaera?, thirdly (and now) Operculodinium. Age: Late Cretaceous.
Parent: Operculodinium