Hystrichosphaeridium gotlandicum Eisenack, 1954

Now Visbysphaera. Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly Multiplicisphaeridium, fourthly (and now) Visbysphaera.
Tax. sr. synonym of Baltisphaeridium peltatum Cramer, 1966, according to Cramer, 1970.
Holotype: Eisenack, 1954, pl.1, fig.5
Age: Silurian (Late Llandovery)