Downiesphaeridium polytrichum

polytrichum (Valensi, 1947, p.818; text-fig.4) Masure in Fauconnier and Masure, 2004, p.196.  Holotype: Valensi, 1947, text-fig.4; Fauconnier and Masure, 2004, pl.24, figs.1-6.  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).  Age: Late Bathonian.

Parent: Downiesphaeridium