Impletosphaeridium tianjinense
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tianjinense (Jiabo, 1978, p.59, pl.29, figs.13-14) Chen et al., 1988, p.8. Holotype: Jiabo, 1978, pl.29, fig.13. Originally Bipolaribucina, subsequently (and now) Impletosphaeridium. Age: Early Tertiary.
Parent: Impletosphaeridium
