Achomosphaera operculata
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"?operculata" Sah et al., 1970, p.144, pl.1, figs.1–2. Holotype: Sah et al., 1970, pl.1, fig.1. NOW Operculodinium. Originally Achomosphaera, subsequently Achomosphaera?, thirdly (and now) Operculodinium. Questionable assignment: Stover and Evitt (1978, p.139). Age: Late Cretaceous.
Parent: Achomosphaera