Exochosphaeridium brevispinum

"?brevispinum" Norvick, 1976, p.53, pl.4, figs.5–6.  Holotype: Norvick, 1976, pl.4, figs.5–6.  NOW Pervosphaeridium.  Originally Exochosphaeridium, subsequently Exochosphaeridium?, thirdly (and now) Pervosphaeridium.  Questionable assignment: Stover and Evitt (1978, p.154).  Age: Cenomanian.

Parent: Exochosphaeridium