Hystrichosphaeridium robustum subsp. fissum

"subsp. fissum" Sannemann, 1955, p.331, pl.1, figs.6-9; pl.6, figs.7-8; text-fig.13.  Holotype: Sannemann, 1955, pl.6, fig.7.  NOW Aldridgeisphaera? robusta subsp. fissa (Appendix A).  Originally Hystrichosphaeridium robustum subsp. fissum, subsequently Baltisphaeridium robustum subsp. fissum (combination illegitimate; Appendix A), thirdly Multiplicisphaeridium robustum subsp. fissum (Appendix A), fourthly (and now) Aldridgeisphaera? robusta subsp. fissa (Appendix A).  Age: Devonian (Late Givetian). Parent: Hystrichosphaeridium robustum