From Fensome et al., 2019:
Apteodinium blandum Yu Jingxian, 1982, p.244, pl.1, fig.15. Holotype: Yu Jingxian, 1982, pl.1, fig.15. Age: Late Jurassic–
Early Cretaceous.

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Original description: [Yu Jingxian, 1982]:

Description:
Cysts ovoid or pyriform, dorsoventrally compressed. Periphragm only, thin. Surface smooth. One small, short apical horn, with a pore at end. No parasuture displayed.
Precingular archeopyle.
Paracingulum annular.

Dimensions:
Size: Cysts 80 - 86 µm long and 58 - 62 µm wide.

Affinities/Comparison:
This new species is distinguished from A. granulatum by its thin wall, smooth surface and one small, short apical horn.