Impletosphaeridium spiralisetum
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?spiralisetum (de Wit, 1943, p.383; text-figs.2,11) Islam, 1993, p.87. Holotype: de Wit, 1943; text-figs.2,11, lost according to R. de Wit (personal communication to GLW). Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium?, fourthly (and now) Impletosphaeridium. Questionable assignment: Islam (1993, p.87). Age: Late Cretaceous.
Parent: Impletosphaeridium
