Alisogymnium laeve, (Vozzhennikova, 1967); Emendation: Lentin and Vozzhennikova, 1990

Originally Gymnodinium sphaerocephalum var. Iaeve, subsequently Dinogymnium sphaerocephalum subsp. 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) Lentin and Vozzhennikova, 1990, pl.2, fig.7b; designated by Lentin and Vozzhennikova, 1990
Locus typicus: Western Siberia (R. Vakh), USSR
Stratum typicum: Senonian

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Original description as Gymnodinium sphaerocephalum var. laeve: [Vozzhennikova, 1967, p. 48]:

Description:
Epitheca hemispherical, separated from the hypotheca by a deep furrow. Hypotheca funnelshaped and ribbed, the surface of the epitheca being smooth.

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Emended description: [Lentin and Vozzhennikova, 1990 p. 27]:

Description:
Cysts shape roundly elongate; epicyst conical to mildly funnel-shaped; hypocyst short, broadly rounded; autophragm microporate, epicyst with delicate longitudinal ridges more or less developed, hypocyst without ridges; archeopyle formed by two short arcuate sutures, which results in the loss of a single apical paraplate: paracingulum deep, dividing the cyst into two unequal portions, the epicyst being longer; parasulcus indistinct, indicated by a shallow longitudinal depression in the slightly off-set paracingulum.

Dimensions/Size:
Neotype: length 42 µm, width 32 µm, width of paracingulum 4 µm.
Range: 39-59 µm in length and 19-33 µm in width.