From Fensome et al., 2019:
Impagidinium paradoxum ssp. granulatum Mao Shaozhi, 1989, p.134–135, pl.26, figs.12,18,19; text-figs.3A–B. Holotype: Mao Shaozhi, 1989, pl.26, figs.12,18. Age: Quaternary.

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