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Operculodinium microtriainum
From Fensome et al., 2019:
Operculodinium 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.
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Locus typicus; Woehrden, Holstein, Germany
Stratum typicum: Late Eocene
Translation Klumpp, 1953: LPP
Original description: Klumpp, 1953, p. 390: Hystrichosphaeridium microtriaina
Diagnosis: A species of the genus Hystrichosphaeridium with the following special characteristics: the membrane of the shell is bi-layered. The numerous processes are formed by the outer layer and terminate in three small hooks.
Description: The shell appears relatively delicate, the outer layer is irregularly sculptured, the netlike ridges rising along the hollow processes.
Diameter: 48 µm; process length: 24-26 µm.
Variation: Diameter 44-100 µm, processes12-36 µm.
Operculodinium 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.
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Locus typicus; Woehrden, Holstein, Germany
Stratum typicum: Late Eocene
Translation Klumpp, 1953: LPP
Original description: Klumpp, 1953, p. 390: Hystrichosphaeridium microtriaina
Diagnosis: A species of the genus Hystrichosphaeridium with the following special characteristics: the membrane of the shell is bi-layered. The numerous processes are formed by the outer layer and terminate in three small hooks.
Description: The shell appears relatively delicate, the outer layer is irregularly sculptured, the netlike ridges rising along the hollow processes.
Diameter: 48 µm; process length: 24-26 µm.
Variation: Diameter 44-100 µm, processes12-36 µm.