Cleistosphaeridium polytrichum

"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 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).  The combination Cleistosphaeridium polytrichum 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