Gymnodinium muticum Vozzhennikova, 1967, p.46–47, pl.1, figs.6–7; pl.2, fig.9. Emendation: Lentin and Vozzhennikova, 1990, p.19–20, as Dinogymnium muticum.

Now Dinogymnium. Originally Gymnodinium, subsequently (and now) Dinogymnium.

Holotype: Vozzhennikova, 1967, pl.1, fig.6; Lentin and Vozzhennikova, 1990, text-fig.6a (lost according to Lentin and Vozzhennikova, 1990.
Neotype: Vozzhennikova, 1967, pl.1, fig.7; Lentin and Vozzhennikova, 1990, pl.2, figs.13-14, text-fig.6b (designated by Lentin and Vozzhennikova, 1990).
Locus typicus: Western Siberia (Yuzhno-Kolpashevsk area)
Stratum typicum: Senonian
Translation Vozzhennikova, 1967: Lentin and Vozzhennikova, 1990

Original description: Vozzhennikova, 1967, p. 46-47
Theca biconical. Epitheca somewhat smaller than hypotheca. Epitheca short, broadly conical with one side straighter than the other giving the theca a somewhat slanting appearance. The hypotheca resembles a bluntly truncated cone. Traverse furrow deep, annulate. Longitudinal furrow barely distinguishable but apparently slit-like. Thecal surface granular.