Goniosphaeridium tuberatum Appendix A

"tuberatum" (Downie, 1958, p.338, pl.17, fig.3; text-fig.3f) Welsch, 1986, p.49.  Holotype: Downie, 1958, pl.17, fig.3.  NOW Acanthodiacrodium (Appendix A).  Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly (and now) Acanthodiacrodium (Appendix A), fourthly Vulcanisphaera (Appendix A), fifthly Goniosphaeridium.  Age: Early Ordovician.

Parent: Goniosphaeridium_Appendix A