Achomosphaera operculata

"?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