Cleistosphaeridium sphericum
From dinoflaj2
"?sphericum" Horowitz, 1975, p.24, pl.1, fig.5. Holotype: Horowitz, 1975, pl.1, fig.5. NOW Impletosphaeridium?. Originally Cleistosphaeridium, subsequently Cleistosphaeridium?, thirdly (and now) Impletosphaeridium?. Questionable assignment: Stover and Evitt (1978, p.32) as a problematic species. Age: Late Jurassic.
Parent: Cleistosphaeridium