Hystrichosphaeridium claviferum
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"claviferum" (Wilkinson, 1849, p.89-92, pl.13, fig.1) Deflandre, 1946a, card 887. Holotype: Wilkinson, 1849, pl.13, fig.1. NOW Baltisphaeridium (Appendix A). Originally Xanthidium (Appendix A), subsequently Hystrichosphaeridium, thirdly (and now) Baltisphaeridium (Appendix A). Age: Late Cretaceous.
Parent: Hystrichosphaeridium
