From Williams et al., 2017:

[Dubridinium, Reid, 1977, p. 449

Type Species: Dubridinium cavatum, Reid, 1977 (pl.3, figs.35–37)]

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Original Description: [Reid, 1977]:

Diagnosis:
Spherical to ovoid cavate cysts with an epitractal archeopyle. Epitract and hypotract of equal size.