Operculodinium microtriainum

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microtriainum (Klumpp, 1953, p.390, pl.17, figs.6–7) Islam, 1983a, p.241.  Emendation: Sarjeant, 1981, p.110–112, as Achomosphaera microtriaina.  Holotype: Klumpp, 1953, pl.17, figs.6–7; Sarjeant, 1981, pl.2, figs.1–2; text-fig.2.  Originally Hystrichosphaeridium, subsequently Cordosphaeridium, thirdly Cordosphaeridium?, fourthly Polysphaeridium, fifthly Achomosphaera, sixthly (and now) Operculodinium.  Taxonomic junior synonym: Operculodinium paucispinosum, according to Jain and Garg (1991, p.80).  Age: late Eocene.

Parent: Operculodinium