Dinogymnium mitratum (Vozzhennikova, 1967) Lentin and Williams, 1973

Now Amphigymnium. Originally Amphidinium, subsequently Dinogymnium, thirdly (and now) Amphigymnium.
Holotype: Vozzhennikova, 1967, pl.1, fig.2; Lentin and Vozzhennikova, 1990, pl.1, figs.10-11, text-fig.12, Appendix A, fig.38
Age: Turonian-Senonian