Visbysphaera brevifurcata (Eisenack, 1954) Lister, 1970

Originally Hystrichosphaeridium, subsequently Baltisphaeridium (an acritarch genus), thirdly (and now) Visbysphaera, fourthly Multiplicisphaeridium (an acritarch genus). Priewalder, 1987 retained this species in Visbysphaera.
Holotype: Eisenack, 1954, pl.1, fig.2
Age: Silurian (Late Llandovery)