Operculodinium placitum
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?placitum Drugg and Loeblich Jr., 1967, p.186, pl.1, figs.9–10,11a–b; text-fig.4. Holotype: Drugg and Loeblich Jr., 1967, pl.1, figs.11a–b. Originally Operculodinium, subsequently Operculodinium?. Questionable assignment: Stover and Evitt (1978, p.179) as a problematic species. Taxonomic junior synonym: Polysphaeridium cephalum, according to Jain and Garg (1991, p.81). Age: late Eocene–Oligocene.
Parent: Operculodinium