Cordosphaeridium microtriainum ssp. nanum (Rozen, 1965) Lenhn and Williams, 1973

Now Cleistosphaeridium? nanum. Originally Cordosphaeridium microtriainum var. nanum, subsequently Cordosphaeridium microtriainum ssp. nanum, thirdly (and now) Cleistosphaeridium? nanum.
Holotype: Rozen, 1965, pl.2, figs.7-8
Age: Late Eocene