Impletosphaeridium polytrichum

?polytrichum (Valensi, 1947, p.818; text-fig.4) Islam, 1993, p.87.  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 Downiesphaeridium, sixthly (and now) Impletosphaeridium?.  Questionable assignment: Peyrot (2011, p.293–294).  Taxonomic junior synonym: Cleistosphaeridium (as Downiesphaeridium) polyacanthum, according to Masure in Fauconnier and Masure (2004, p.196).  Age: late Bathonian.

Parent: Impletosphaeridium