Hystrichosphaeridium erraticum Eisenack, 1954

Now Visbysphaera. Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly (and now) Visbysphaera, fourthly Multiplicisphaeridium.

Holotype: Eisenack, 1954, pl.1, fig.6
Age: Silurian (Late Ludlow)