Rhynchodiniopsis ambigua (Deflandre, 1938) Sarjeant, 1982
Now Leptodinium. Originally Gonyaulax, subsequently Gonyaulacysta, thirdly Millioudodinium, fourthly Rhynchodiniopsis, fifthly (and now) Leptodinium.
Holotype: Deflandre, 1938, pl.6, fig.2; Jan du Chêne et al., 1986, pl.68, figs.1-3
Age: Kimmeridgian