Cordosphaeridium uncinispinosum
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"?uncinispinosum" de Coninck, 1969, p.32–33, pl.9, figs.6–8. Holotype: de Coninck, 1969, pl.9, figs.6–8. NOW Operculodinium. Originally Cordosphaeridium, subsequently Cordosphaeridium?, thirdly Cleistosphaeridium, fourthly (and now) Operculodinium. Questionable assignment: Stover and Evitt (1978, p.147) as a problematic species. Age: early Eocene.
Parent: Cordosphaeridium