Hystrichosphaeridium cristatum

"cristatum" Downie, 1958, p.338–339, pl.16, fig.4; text-fig.4f.  Holotype: Downie, 1958, pl.16, fig.4.  NOW Cymatiogalea (Appendix A).  Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Priscogalea (Appendix A), fourthly (and now) Cymatiogalea (Appendix A).  Taxonomic junior synonym: Cymatiogalea polygonomorpha Górka, 1967, an acritarch species, according to Rasul (1974, p.56).  Age: Early Ordovician.

Parent: Hystrichosphaeridium