Baltisphaeridium ordovicum Appendix A
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ordovicum (Timofeev, 1959, p.56, pl.4, fig.20) Downie and Sarjeant, 1965, p.94. Holotype: Timofeev, 1959, pl.4, fig.20. Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium. This combination was not validly published in Downie and Sarjeant (1963, p.94), since these authors did not fully reference the basionym. Age: Early Ordovician.
Parent: Baltisphaeridium
