Phthanoperidinium geminatum Bujak in Bujak et al., 1980, p.72,74, pl.19, figs.8-12; text-figs.20D,22A.
TYPE: Holotype: Bujak et al., 1980, pl.19, figs.9-11.
AGE: Mid Eocene (see Aubry, 1986).