Hystrichosphaeridium williereae

"williereae" Martin, 1966a, p.389–391, pl.1, fig.23; text-figs.33–34.  Holotype: Martin, 1966a, pl.1, fig.23.  NOW Dilatisphaera (Appendix A).  Originally Hystrichosphaeridium, subsequently Dilatisphaera (combination not validly published; Appendix A), thirdly Palaeohystrichosphaeridium (Appendix A), fourthly (and now) Dilatisphaera.  Taxonomic junior synonym: Ozotobrachion? podolicus Sheshegova, 1973, an acritarch species, according to Kiryanov (1978, p.90).  Age: Silurian (Llandovery).

Parent: Hystrichosphaeridium