Baltisphaeridium tuberatum Appendix A
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"tuberatum" (Downie, 1958, p.338, pl.17, fig.3; text-fig.3f) Downie and Sarjeant, 1965, p.98. Holotype: Downie, 1958, pl.17, fig.3. NOW Acanthodiacrodium (Appendix A). Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly (and now) Acanthodiacrodium (Appendix A), fourthly Vulcanisphaera (Appendix A), fifthly Goniosphaeridium (Appendix A). This combination was not validly published in Downie and Sarjeant (1963, p.91), since these authors did not fully reference the basionym. Hu Yunxu (1986, p.219) also proposed this combination. Age: Early Ordovician.
Parent: Baltisphaeridium
