Baltisphaeridium robustum subsp. fissum Appendix A
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"subsp. fissum" (Sannemann, 1955, p.331, pl.6, fig.9; text-figs.14a-c) Downie and Sarjeant, 1965, p.95. Holotype: Sannemann, 1955, pl.6, fig.9. Combination illegitimate: the specific name is illegitimate. NOW Aldridgeisphaera? robusta subsp. fissa (Appendix A). Originally Hystrichosphaeridium robustum subsp. fissum, subsequently Baltisphaeridium robustum subsp. fissum (combination illegitimate), thirdly Multiplicisphaeridium robustum subsp. fissum (Appendix A), fourthly (and now) Aldridgeisphaera? robusta subsp. fissa (Appendix A). This combination was not validly published in Downie and Sarjeant (1963, p.90), since these authors did not fully reference the basionym. Age: Devonian (Late Givetian).Baltisphaeridium robustum
