Rhynchodiniopsis setcheyensis (Sarjeant, 1976) Sarjeant, 1982
Now Impagidinium. Originally Gonyaulacysta, subsequently Leptodinium, thirdly Rhynchodiniopsis, fourthly (and now) Impagidinium. Holotype: Sarjeant, 1976, pl.1, fig.7; Jan du Chêne et al., 1986, pl.74, figs.1-4
Age: Kimmeridgian