Hystrichosphaeridium divergens forma areolatum

"forma areolatum" Eisenack 1954b, p.67, pl.9, fig.16.  Holotype: Eisenack 1954b, pl.9, fig.16.  Taxonomic senior synonym (at specific rank): Operculodinium eisenackii, according to Heilmann-Clausen and Van Simaeys (2005, p.176).  Age: Oligocene.

Parent: Hystrichosphaeridium divergens