Cleistosphaeridium polytrichum
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"polytrichum" (Valensi, 1947, p.818, text-fig.4) Davey et al., 1969, p.16. Holotype: Valensi, 1947, text-fig.4; Fauconnier and Masure, 2004, pl.24, figs.1-6. NOW Downiesphaeridium. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium, fourthly Impletosphaeridium, fifthly (and now) Downiesphaeridium. Taxonomic junior synonym: Cleistosphaeridium (as Downiesphaeridium) polyacanthum, according to Masure in Fauconnier and Masure (2004, p.196). This combination was not validly published in Davey et al. (1966, p.170), since these authors did not fully reference the basionym. Age: Late Bathonian.
Parent: Cleistosphaeridium
