Hystrichosphaeridium microtriainum
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"microtriainum" Klumpp, 1953, p.390, pl.17, figs.6-7. 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. NOW Operculodinium. Originally Hystrichosphaeridium, subsequently Cordosphaeridium, thirdly Cordosphaeridium?, fourthly Polysphaeridium, fifthly Achomosphaera, sixthly (and now) Operculodinium. Age: Late Eocene.
Parent: Hystrichosphaeridium