Cleistosphaeridium bulbum
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"bulbum" Yu Jingxian, 1989, p.140, pl.51, figs.8-9. Holotype: Yu Jingxian, 1989, pl.51, fig.8. NOW Downiesphaeridium?. Originally Cleistosphaeridium, subsequently Downiesphaeridium, thirdly (and now) Downiesphaeridium?. Age: Eocene.
Parent: Cleistosphaeridium