Baltisphaeridium hamatum Appendix A
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hamatum (Downie, 1958, p.335, pl.16, fig.1; text-figs.2j-k) Kjellström, 1976, p.18. Holotype: Downie, 1958, pl.16, fig.1. Originally Hystrichosphaeridium hirsutoides var. hamatum, subsequently Baltisphaeridium hirsutoides var. hamatum (Appendix A), thirdly Micrhystridium hamatum (Appendix A), fourthly Acanthodiacrodium hamatum (Appendix A), fifthly (and now) Baltisphaeridium hamatum. Age: Early Ordovician.
Parent: Baltisphaeridium
