From Williams et al., 2017:

[Ellipsodinium, Clarke and Verdier, 1967,p. 68-69

Lentin and Williams (1985, p.123) incorrectly stated that Dictyopyxidia is a taxonomic junior synonym of Ellipsodinium.

Type species: Ellipsodinium rugulosum, Clarke and Verdier, 1967 (pl.14, fig.6)]

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Original description: [Clarke and Verdier, 1967]:

Description:
Main body oval, elliptical or rounded in outline. Girdle present. Archeopyle precingular. Reticulate sculpture. No tabulation, apical or antapical protrusions or inner body.

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Modified description:

Stover and Evitt, 1978, p. 153:

Synopsis:
Cysts proximochorate, subspherical to ellipsoidal, with low, generally longitudinal, occasionally oblique, discontinuous ridges; archeopyle precingular, Type P.

Description:
Shape: Subspherical to ellipsoidal.
Wall relationships: Autophragm only.
Wall features: No parasutural features. Surface with multiple low discontinuous ridges that are generally longitudinal, occasionally oblique; ridges may form imperfect reticulum.
Paratabulation: Indicated by archeopyle and paracingulum; formula unknown.
Archeopyle: Precingular, Type P (3`` only); operculum free.
Paracingulum: Indicated by interruption of ridges in equatorial area.
Parasulcus: Not indicated.
Size: Small to intermediate.

Affinities:
Ellipsodinium differs from Apteodinium in having longitudinal to oblique ridges on the autophragm, rather than evenly distributed features of low relief.

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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.

Ellipsodinium Clarke and Verdier, 1967, has an oval main body, elliptical or rounded in outline. Cingulum present. Archeopyle precingular. Reticulate sculpture. No tabulation, apical or antapical protrusions, or inner body. It differs from Ellipsoidictyum in having a precingular archeopyle.