Vulcanisphaera tuberata (Downie, 1958) Eisenack et al., 1973
Now Goniosphaeridium (an acritarch genus). Originally Hystrichosphaeridium, subsequently Baltisphaeridium (an acritarch genus), thirdly Acanthodiacrodium (an acritarch genus), fourthly Vulcanisphaera, fifthly (and now) Goniosphaeridium (an acritarch genus).
Holotype: Downie, 1958, pl.17, fig.3
Age: Early Ordovician