From Fensome et al., 2019:
Saeptodinium circulare Jin Guangxing, He Chengquan and Zhu Shenzhao in He Chengquan et al., 1989, p.66, pl.2, figs.16–18.
Holotype: He Chengquan et al., 1989, pl.2, fig.17. Age: Eocene.

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