Hystrichosphaeridium polytrichum
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"polytrichum" Valensi, 1947, p.818; text-fig.4. Holotype: Valensi, 1947, text-fig.4; Fauconnier and Masure, 2004, pl.24, figs.1–6. 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). Age: late Bathonian.
Parent: Hystrichosphaeridium