Impletosphaeridium baculatum (He Chengquan and Li Peng, 1981, p.62, pl.34, figs.21-22) Islam, 1993, p.85.
Holotype: He Chengquan and Li Peng, 1981, pl.34, fig.21; Fauconnier and Masure, 2004, pl.48, fig.7.
Originally Cleistosphaeridium, subsequently (and now) Impletosphaeridium.
Age: Late Oligocene.