Bion fluctuans, Eisenack, 1938

Now Baltisphaeridium (an acritarch genus). Originally Bion, subsequently Hystrichosphaeridium thirdly (and now) Baltisphaeridium (an acritarch genus); see also Polysphaeridium? (combination not validly published).

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