Hystrichosphaeridium spiralisetum
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"spiralisetum" de Wit, 1943, p.383; text-figs.2,11. Holotype: de Wit, 1943, text-figs.2,11, lost according to de Wit (personal communication to GLW). NOW Impletosphaeridium?. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium?, fourthly (and now) Impletosphaeridium?. Age: Late Cretaceous.
Parent: Hystrichosphaeridium