Hystrichosphaeridium microspinosum

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"microspinosum" Eisenack, 1954a, p.209-210, pl.1, fig.8.  Holotype: Eisenack, 1954a, pl.1, fig.8.  NOW Baltisphaeridium (Appendix A).  Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium (Appendix A), thirdly Lophosphaeridium (Appendix A), fourthly Visbysphaera (Appendix A), fifthly Buedingiisphaeridium (combination not validly published; Appendix A).  Taxonomic junior synonym: Baltisphaeridium listeri Kiryanov, 1978, an acritarch species, according to Le Hérissé (1989, p.210).  Age: Silurian (Late Llandovery).

Parent: Hystrichosphaeridium