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Achomosphaera microtriaina

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

EMENDATION: Sarjeant, 1981, p.110-112, as Achomosphaera microtriaina.

TYPE: Holotype: Klumpp, 1953, pl.17, figs.6-7; Sarjeant, 1981, pl.2, figs.1-2; text-fig.2.

HISTORY: NOW: Operculodinium. Originally Hystrichosphaeridium, subsequently Cordosphaeridium, thirdly Cordosphaeridium?, fourthly Polysphaeridium, fifthly Achomosphaera, sixthly (and now) Operculodinium.

AGE: Late Eocene.


Infraspecific taxa:


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