Hystrichosphaeridium fluctuans
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"fluctuans" (Eisenack, 1938c, p.230-231, pl.16, figs.1--3) Pastiels, 1948, p.40. Holotype: Eisenack, 1938c, pl.16, fig.3. NOW Baltisphaeridium (Appendix A). Originally Bion (Appendix A), subsequently Hystrichosphaeridium, thirdly Polysphaeridium? (combination not validly published), fourthly (and now) Baltisphaeridium (Appendix A). Age: Silurian.
Parent: Hystrichosphaeridium