Hystrichosphaeridium sibiricum
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"sibiricum" Timofeev, 1966, p.46–47, pl.9, fig.3. Holotype: Timofeev, 1966, pl.9, fig.3. NOW Peteinosphaeridium? (Appendix A). Originally Hystrichosphaeridium, subsequently (and now) Peteinosphaeridium? (Appendix A). This name was not validly published in Timofeev (1963, fig.1, no.12) since no description was provided. Age: Late Ordovician.
Parent: Hystrichosphaeridium