Operculodinium placitum

?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