Polysphaeridium fluctuans

"?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