Hystrichosphaeridium laevigatum
From dinoflaj2
"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