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Cleistosphaeridium nanus
Cleistosphaeridium? nanum, (Rozen, 1965), Sarjeant, 1981
Originally Cordosphaeridium microtriainum var. nanum, subsequently Cordosphaeridium microtriainum ssp. nanum, thirdly Cleistosphaeridium? nanum, fourthly (and now) Impletosphaeridium.
At the time of the transfer, Sarjeant, 1981, raised this taxon to the species level and questionably included it in Cleistosphaeridium.
Holotype: Rozen, 1965, pl.2, figs.7-8
Age: Late Eocene
Originally Cordosphaeridium microtriainum var. nanum, subsequently Cordosphaeridium microtriainum ssp. nanum, thirdly Cleistosphaeridium? nanum, fourthly (and now) Impletosphaeridium.
At the time of the transfer, Sarjeant, 1981, raised this taxon to the species level and questionably included it in Cleistosphaeridium.
Holotype: Rozen, 1965, pl.2, figs.7-8
Age: Late Eocene