Hystrichosphaeridium laevigatum

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"laevigatum" (Lister, 1970, p.66, pl.6, figs.10–12; text-figs.18,20d) Eisenack and Kjellström, 1975b, p.652b.  Holotype: Lister, 1970, pl.6, fig.10.  NOW Dilatisphaera (Appendix A).  Originally (and now) Dilatisphaera (Appendix A), subsequently Hystrichosphaeridium.  Age: Silurian (Wenlock).

Parent: Hystrichosphaeridium