Polysphaeridium congregatum
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congregatum (Stover, 1977, p.79, pl.3, figs.39–44) Bujak et al., 1980, p.34. Holotype: Stover, 1977, pl.3, figs.39–42. Originally Hemicystodinium, subsequently (and now) Polysphaeridium. Age: middle Oligocene.
