Cordosphaeridium microtriainum subsp. nanus

"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