Operculodinium centrocarpum subsp. amplum

subsp. amplum (Wetzel, 1955, p.38; text-fig.11) Sarjeant, 1984c, p.130.  Emendation: Sarjeant, 1984c, p.131, as Operculodinium centrocarpum subsp. amplum.  Holotype: Wetzel, 1955, text-fig.11; Sarjeant, 1984c, pl.3, figs.1-3; text-fig.4.  Originally Hystrichosphaeridium hirsutum subsp. amplum (name not validly published), subsequently Baltisphaeridium hirsutum subsp. amplum (name not validly published; Appendix A), thirdly Operculodinium? hirsutum subsp. amplum (name not validly published), fourthly (and now) Operculodinium centrocarpum subsp. amplum.  Age: Danian. Parent: Operculodinium centrocarpum