Micrhystridium hamatum Appendix A
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"hamatum" (Downie, 1958, p.335, pl.16, fig.1; text-figs.2j-k) Deflandre and Deflandre-Rigaud, 1965, fiche 2248. Holotype: Downie, 1958, pl.16, fig.1. NOW Baltisphaeridium hamatum (Appendix A). Originally Hystrichosphaeridium hirsutoides var. hamatum, subsequently Baltisphaeridium hirsutoides var. hamatum (Appendix A), thirdly Micrhystridium hamatum, fourthly Acanthodiacrodium hamatum (Appendix A), fifthly (and now) Baltisphaeridium hamatum (Appendix A). Age: Early Ordovician.
Parent: Micrhystridium
