Leptodinium ambiguum (Deflandre, 1939) Helenes, 1984

Originally Gonyaulax, subsequently Gonyaulacysta, thirdly Millioudodinium, fourthly Rhynchodiniopsis, fifthly (and now) Leptodinium.

Holotype: Deflandre, 1939, pl.6, fig.2; Jan du Chêne et al., 1986, pl.68, figs.1-3
Age: Kimmeridgian