Goniosphaeridium tuberatum (Downie, 1958) Welsch, 1986
Acritarch genus

Originally Hystrichosphaeridium, subsequently Baltisphaeridium (an acritarch genus), thirdly Acanthodiacrodium (an acritarch genus), fourthly Vulcanisphaera (an acritarch genus), fifthly (and now) Goniosphaeridium.

Holotype: Downie, 1958, pl.17, fig.3
Age: Early Ordovician