Ceratiopsis leptoderma, Vozzhennikova, 1963, p.181; text-fig.8.

NOW Cerodinium. Originally Ceratiopsis (generic name illegitimate), subsequently Deflandrea, thirdly (and now) Cerodinium. Lentin and Williams, 1976, transferred this species to Deflandrea Eisenack, 1938. Lentin and Williams, 1977, retained it in Ceratiopsis. Stover and Evitt, 1978, retained it in Deflandrea; however, Lentin and Williams, 1981, retained it in Ceratiopsis.
Following I.C.N. Article 55.1, the species name Ceratiopsis leptoderma is validly published even though the generic name Ceratiopsis is illegitimate.

Holotype: Vozzhennikova, 1963, text-fig.8; Lentin and Vozzhennikova, 1990, pl.4, figs.4–5; text-fig.15.
Locus typicus: Western Siberia (Uvat), USSR
Age: Paleocene.

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Original description: [Vozzhennikova, 1963, p. 180]: (Translation: Lentin and Vozzhennikova, 1990):

Description:
Cells ovally elongate or ovate with long horns, one apical and two antapical, slightly divergent. Girdle annular, running round the equator or displaced slightly forward. Longitudinal groove on epivalve not developed but on the hypovalve extending to the posterior margin. Membrane slightly yellow, leathery, thin, delicate, smooth. Internal cell cavity occupied by internal body of darker color than membrane.

Dimensions:
Length of cell with processes 126.5-177 µm, width 50.6-60 µm, length of apical horn 34.5-52.9 µm, length of antapical horns 20-32 µm.