Hystrichosphaeridium cylindratum Morgenroth 1966a
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cylindratum Morgenroth, 1966a, p.30, pl.8, figs.3–4. Holotype: Morgenroth, 1966a, pl.8, figs.3–4. Junior homonym: Hystrichosphaeridium cylindratum Brideaux, 1971. Age: early Eocene.
Parent: Hystrichosphaeridium