Achomosphaera microtriaina

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"microtriaina" (Klumpp, 1953, p.390, pl.17, figs.6–7) Sarjeant, 1981, p.110–112.  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: Achomosphaera