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