Dinogymnium rigaudiae Boltenhagen, 1977

Now Amphigymnium. Originally Dinogymnium, subsequently (and now) Amphigymnium.
Holotype: Boltenhagen, 1977, pl.11, figs.a-b and Lentin and Vozzhennikova, 1990, Appendix A, fig.39
Age: Campanian-Maastrichtian