Microdinium dentatum subsp. sphaericum
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"subsp. sphaericum" (Vozzhennikova, 1967, p.95-96, pl.36, figs.2a-b; pl.38, figs.1a-b) Lentin and Williams, 1973, p.95. Emendation: Lentin and Vozzhennikova, 1990, p.115, as Sokolovidinium sphaericum. Holotype: Vozzhennikova, 1967, pl.38, figs.1a-b; Lentin and Vozzhennikova, 1990, pl.13, figs.5-6; text-fig.67. NOW Sokolovidinium sphaericum. Originally Microdinium dentatum forma sphaericum, subsequently Microdinium dentatum subsp. sphaericum, thirdly (and now) Sokolovidinium sphaericum. Age: Late Cretaceous. Parent: Microdinium dentatum
