Hystrichosphaeridium williereae
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"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