Cleistosphaeridium patagonicum
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"?patagonicum" Archangelsky, 1969b, p.200–201, pl.3, figs.9–10. Holotype: Archangelsky, 1969b, pl.3, figs.9–10. NOW Impletosphaeridium. Originally Cleistosphaeridium, subsequently Cleistosphaeridium?, thirdly (and now) Impletosphaeridium. Questionable assignment: Stover and Evitt (1978, p.32) as a problematic species. Age: Eocene.
Parent: Cleistosphaeridium