Phthanoperidinium lambdoideum

?lambdoideum (E. Nagy, 1966, p.39–40, pl.1, figs.1–3; text-figs.1a–b) Eisenack and Kjellström, 1972, p.909. Holotype: E. Nagy, 1966, pl.1, figs.1–3; text-figs.1a–b. Originally Peridinium (Appendix B), subsequently Phthanoperidinium, thirdly (and now) Phthanoperidinium?. Questionable assignment: Stover and Evitt (1978, p.119) as a problematic species. Age: early Pliocene.