From Fensome et al., 2019:
Dinogymnium heterocostatum ssp. kolpaschevii (Vozzhennikova, 1967, p.45, pl.3, fig.5) Lentin and Williams, 1973, p.49. Holotype: Vozzhennikova, 1967, pl.3, fig.5; Lentin and Vozzhennikova, 1990, pl.3, fig.1; text-fig.4. Originally Gymnodinium heterocostatum var. kolpaschevi (Appendix B), subsequently (and now) Dinogymnium heterocostatum subsp. kolpaschevii. Lentin and Vozzhennikova (1990, p.17) provided an "expanded description" for this taxon. Age: Senonian.

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Translation Vozzhennikova, 1967: Lentin and Vozzhennikova, 1990

Original description: Vozzhennikova, 1967, p. 45: Gymnodinium heterocostatum var. kolpaschevii
Epitheca and hypotheca of almost equal size. Epitheca bell-shaped, hypotheca funnel-shaped with an attenuated antapical end. Transverse furrow deep, its margin wavy. Longitudinal furrow slit-like, extending along both epitheca and hypotheca. Ribs of varying length extend from the transverse furrow in the direction of the poles. Theca is light-colored, smooth or fine grained.

Expanded description: Lentin and Vozzhennikova, 1990, p. 17
Cyst shape elongate; epicyst funnel-shaped with pointed apex; hypocyst short, bluntly conical; autophragm finely granulose with well defined longitudinal ridges; ridges extending to the apex and antapex, interuptet only by the paracingulum; archeopyle not observed; paracingulum deep with crenulate margins due to the distinct longitudinal ridges, dividing the cyst into two nearly equal portions; parasulcus not well defined.
Size: Holotype, length 52 µm, width 27 µm, width of paracingulum about 4 µm.