Hystrichosphaeridium brevispinosum subsp. callosum
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"subsp. callosum" Sannemann, 1955, p.325-326, pl.1, figs.1-4,7; pl.3, figs.2-5,10; pl.4, figs.3-9; pl.6, figs.11-12; text-figs.2a-d. Holotype: Sannemann, 1955, pl.4, fig.3. NOW Baltisphaeridium brevispinosum subsp. callosum (Appendix A). Originally Hystrichosphaeridium brevispinosum subsp. callosum, subsequently Buedingiisphaeridium brevispinosum subsp. callosum (combination not validly published; Appendix A), thirdly (and now) Baltisphaeridium brevispinosum subsp. callosum (Appendix A). Age: Devonian (Late Givetian). Parent: Hystrichosphaeridium brevispinosum
