Impletosphaeridium spiralisetum

?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