Baltisphaeridium fluctuans, (Eisenack, 1938c, p.230–231, pl.16, figs.1–3), Lentin and Williams, 1993, p.699.

Originally Bion, subsequently Hystrichosphaeridium, thirdly (and now) Baltisphaeridium; see also Polysphaeridium? (combination not validly published). The new combination Baltisphaeridium fluctuans is proposed to accommodate a taxon whose morphology appears to conform to that of Baltisphaeridium.

Holotype: Eisenack, 1938, pl.16, fig.3
Age: Silurian