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Baltisphaeridium apiculatum
Baltisphaeridium apiculatum, (Timofeev, 1959), Downie and Sarjeant, 1965
Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium; see also Goniosphaeridium (an acritarch genus; combination not validly published). This combination was not validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.
Holotype: Timofeev, 1959, pl.4, fig.3
Age: Early Ordovician
Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium; see also Goniosphaeridium (an acritarch genus; combination not validly published). This combination was not validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.
Holotype: Timofeev, 1959, pl.4, fig.3
Age: Early Ordovician