Cleistosphaeridium spinulastrum
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"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