From Fensome et al., 2019:
Impletosphaeridium 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.

---------------------------------------------------------------------------------------------------