From Fensome et al., 2019:

Dubridinium, Reid, 1977, p.449.
Type: Reid, 1977, pl.3, figs.35–37, as Dubridinium cavatum.

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Original Description: [Reid, 1977]:

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