Impletosphaeridium shandongense (He Chengquan, Zhu Shenzhao and Jin Guangxing in He Chengquan et al., 1989, p.44, pl.18, figs.5-6; pl.30, figs.3-6) Williams et al., 1998, p.335.

Originally Cleistosphaeridium, subsequently (and now) Impletosphaeridium.

Holotype: He Chengquan et al., 1989, pl.18, fig.6.
Age: Early Tertiary.