Cleistosphaeridium uncinispinosum

"uncinispinosum" (de Coninck, 1969, p.32–33, pl.9, figs.6–8) Sarjeant, 1981, p.123–124.  Holotype: de Coninck, 1969, pl.9, figs.6–8.  NOW Operculodinium.  Originally Cordosphaeridium, subsequently Cordosphaeridium?, thirdly Cleistosphaeridium, fourthly (and now) Operculodinium.  Age: early Eocene.

Parent: Cleistosphaeridium