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Cordosphaeridium microtriainum

"Cordosphaeridium? microtriainum" (Klumpp, 1953, p.390, pl.17, figs.6-7) Eisenack 1963b, p.263.

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. Questionable assignment: Stover and Evitt (1978, p.147), as a problematical species.

AGE: Late Eocene.


Infraspecific taxa:


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