Cleistosphaeridium microcystum

"microcystum" (Bujak in Bujak et al., 1980, p.88,90, pl.22, figs.2–5) Lentin and Williams, 1981, p.49.  Holotype: Bujak et al., 1980, pl.22, figs.2–3; Fauconnier and Masure, 2004, pl.64, figs.4–5.  NOW Pilosidinium.  Originally Tenua Eisenack, subsequently Cleistosphaeridium, thirdly Sentusidinium, fourthly (and now) Pilosidinium.  Age: middle Eocene (see Aubry, 1986).

Parent: Cleistosphaeridium