Operculodinium microtriainum
From dinoflaj3
microtriainum (Klumpp, 1953, p.390, pl.17, figs.6–7) Islam, 1983a, p.241. 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. Originally Hystrichosphaeridium, subsequently Cordosphaeridium, thirdly Cordosphaeridium?, fourthly Polysphaeridium, fifthly Achomosphaera, sixthly (and now) Operculodinium. Taxonomic junior synonym: Operculodinium paucispinosum, according to Jain and Garg (1991, p.80). Age: late Eocene.
Parent: Operculodinium