From Fensome et al., 2019:
Oligosphaeridium ovatum He Chengquan, Zhu Shenzhao and Jin Guangxing in He Chengquan et al., 1989, p.54, pl.19, figs.18–22. Holotype: He Chengquan et al., 1989, pl.19, fig.20. Age: early Tertiary.

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