From Fensome et al., 2019:
Cleistosphaeridium minus Jiabo, 1978, p.62, pl.20, figs.13–16. Holotype: Jiabo, 1978, pl.20, fig.16. NOW Impletosphaeridium. Originally Cleistosphaeridium, subsequently (and now) Impletosphaeridium. Age: early Tertiary.

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