Hystrichospharidium fluctuans (Eisenack, 1938) Pastiels, 1948

Now Baltisphaeridium. Originally Bion, subsequently Hystrichosphaeridium, thirdly (and now) Baltisphaeridium. See also Polysphaeridium? (combination not validly published).
Holotype: Eisenack, 1938, pl.16, fig.3
Age: Silurian