From Fensome et al., 2019:
Cladopyxidium saeptum (Morgenroth, 1968, p.536–537, pl.41, figs.7–9; pl.42, fig.1) Stover and Evitt, 1978, p.30. Holotype: Morgenroth, 1968, pl.41, fig.7; Eisenack and Kjellström, 1971, p.516a; Fensome et al., 1995, fig.1 — p.1755. Originally Microdinium, subsequently (and now) Cladopyxidium. Taxonomic junior synonyms: Microdinium robustum and Cladopyxidium septatum, both according to Stover and Evitt (1978, p.30). The nomenclatural type of the genus Cladopyxidium remains the holotype of Cladopyxidium septatum. Age: Danian.

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Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.

Cladopyxidium saeptum (Morgenroth, 1968) Stover and Evitt, 1978. Description as for genus with tabulation delineated by membranes. Note broad sulcus with small plates.
Size: length 15-22 µm, width 14-20 µm, height of crests 1-2 µm.