Cleistosphaeridium spinulastrum

"spinulastrum" Islam, 1983b, p.337–338, pl.2, figs.1–2.  Holotype: Islam, 1983b, pl.2, fig.1; Islam, 1993, pl.1, fig.11.  NOW Downiesphaeridium.  Originally Cleistosphaeridium, subsequently (and now) Downiesphaeridium.  Age: middle Eocene.

Parent: Cleistosphaeridium