Exochosphaeridium brevispinum
From dinoflaj3
"?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