Hystrichopsphaeridium piriferum Eisenack, 1954

Now Visbysphaera. Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly Multiplicisphaeridium, fourthly (and now) Visbysphaera.
Tax. sr. synonym of Baltisphaeridium hermosum Cramer and Diez, 1968 (a name not validly published), according to Cramer, 1970.
Holotype: Eisenack, 1954, pl.1, figs.1a-b
Age: Silurian (Late Llandovery)