Operculodinium operculatum

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