Cleistosphaeridium sphericum

"?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