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