Operculodinium hirsutum subsp. amplum

"subsp. amplum" (Wetzel, 1955, p.38; text-fig.11) Lentin and Williams, 1973, p.102.  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.  Name not validly published: the species name Operculodinium? hirsutum is not validly published.  NOW Operculodinium centrocarpum subsp. amplum.  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 hirsutum