Cordosphaeridium microtriainum
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"?microtriainum" (Klumpp, 1953, p.390, pl.17, figs.6–7) Eisenack 1963b, p.263. 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. Questionable assignment: Stover and Evitt (1978, p.147) as a problematic species. Age: late Eocene.
Parent: Cordosphaeridium
Infrataxon List: