Oligosphaeridium ovatum
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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.
Parent: Oligosphaeridium