Gonyaulacysta mirabilis (Klement, 1960, p.48–50, pl.6, figs.7–10; text-figs.25–27) Dodekova, 1967, p.19. Emendation: Sarjeant, 1984a, p.164–166, as Leptodinium mirabile.

Now Leptodinium. Originally (and now) Leptodinium, subsequently Gonyaulacysta.

Holotype: Klement, 1960, pl.6, figs.7-8; text-figs.25-26; Sarjeant, 1984, pl.4, figs.1-2; text-fig.5; Jan du Chêne et al., 1986, pl.67, figs.5-8
Age: Middle Oxfordian