Impletosphaeridium elegans (He Chengquan, Zhu Shenzhao and Jin Guangxing in He Chengquan et al., 1989, p.43, pl.18, figs.1-4) Williams et al., 1998, p.332.
Holotype: He Chengquan et al., 1989, pl.18, fig.1.
Originally Cleistosphaeridium, subsequently (and now) Impletosphaeridium.
Age: Early Tertiary.