Lophosphaeridium microspinosum (Eisenack, 1954) Downie, 1963
Acritarch genus.

Now Visbysphaera (an acritarch genus). Originally Hystrichosphaeridium, subsequently Baltisphaeridium (an acritarch genus), thirdly Lophosphaeridium, fourthly (and now) Visbysphaera (an acritarch genus), see also Buedingiisphaeridium (an acritarch genus; combination not validly published).
Holotype: Eisenack, 1954, pl.1, fig.8
Age: Silurian (Late Llandovery)