Downiesphaeridium bulbum (Yu Jingxian, 1989, p.140, pl.51, figs.8-9) Williams et al., 1998, p.203.

Originally Cleistosphaeridium, subsequently Downiesphaeridium, thirdly (and now) Downiesphaeridium?. Questionable assignment: Masure in Fauconnier and Masure (2004, p.196).

Holotype: Yu Jingxian, 1989, pl.51, fig.8.
Age: Eocene.