Polysphaeridium fluctuans
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"?fluctuans" (Eisenack, 1938c, p.230-231, pl.16, figs.1-3) Davey and Williams, 1966b, p.95. Holotype: Eisenack, 1938c, pl.16, fig.3. Name not validly published: basionym not fully referenced. NOW Baltisphaeridium (Appendix A). Originally Bion (Appendix A), subsequently Hystrichosphaeridium, thirdly Polysphaeridium? (combination not validly published), fourthly (and now) Baltisphaeridium (Appendix A). Questionable assignment: Davey and Williams (1966b, p.95). Age: Silurian.
Parent: Polysphaeridium