Cordosphaeridium microtriainum subsp. nanus
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"subsp. nanus" (Rozen, 1965, p.311, pl.2, figs.7–8; text-fig.21) Lentin and Williams, 1973, p.33. Holotype: Rozen, 1965, pl.2, figs.7–8. NOW Impletosphaeridium nanus. Originally Cordosphaeridium microtriainum var. nanus, subsequently Cordosphaeridium microtriainum subsp. nanus, thirdly Cleistosphaeridium? nanus, fourthly (and now) Impletosphaeridium nanus. N.I.A. Age: late Eocene.
Parent: Cordosphaeridium microtriainum