Gymnodinium sphaerocephalum var. laeve Vozzhennikova, 1967, p.48, pl.1, fig.4; pl.2, fig.5. Emendation: Lentin and Vozzhennikova, 1990, p.26–27, as Alisogymnium laeve

Now Alisogymnium laeve. Originally Gymnodinium sphaerocephalum var. Iaeve, subsequently Dinogymnium sphaerocephalum ssp. Iaeve, thirdly (and now) Alisogymnium laeve.

Holotype: Vozzhennikova, 1967, pl.2, fig.5; Lentin and Vozzhennikova, 1990, pl.2, fig.7a (lost, according to Lentin and Vozzhennikova, 1990)
Neotype: Harland, 1973, pl.85, figs.2-3 (as Dinogymnium longicornis) and Lentin and Vozzhennikova, 1990, pl.2, fig.7b (designated by Lentin and Vozzhennikova, 1990
Locus typicus: Western Siberia (R. Vakh)
Stratum typicum: Senonian

Original description: Vozzhennikova, 1967, p.48
Epitheca hemispherical, separated from the hypotheca by a deep furrow. Hypotheca funnelshaped and ribbed, the surface of the epitheca being smooth.