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Cleistosphaeridium polytrichum

Cleistosphaeridium polytrichum, (Valensi, 1947, p.818; text-fig.4), Islam, 1993, p.87.

NOW Impletosphaeridium? Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium, fourthly Impletosphaeridium, fifthly Downiesphaeridium, sixthly (and now) Impletosphaeridium?.
Taxonomic junior synonym: Cleistosphaeridium (as Downiesphaeridium) polyacanthum, according to Masure in Fauconnier and Masure (2004, p.196).

Holotype: Valensi, 1947; text-fig.4; Fauconnier and Masure, 2004, pl.24, figs.1-6.
Age: Late Bathonian.

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Original sentence in Valensi 1947: "En outre, des silex du Bathonien supérieur renferment des Hystrichosphaeridium (H. polytrichum nov. sp., fig. 4) et des Péridiniens.
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