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Baltisphaeridium sexradiatum
Baltisphaeridium sexradiatum, (Timofeev, 1959), Downie and Sarjeant, 1965
Originally Hystrichosphaeridium, subsequently Baltisphaeridium.
Tax. jr. synonym of the acritarch species Hystrichosphaeridium (now Goniosphaeridium) polygonale Eisenack, 1931 ex Eisenack, 1938, according to Eisenack, 1965. 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.7
Age: Early Ordovician
Originally Hystrichosphaeridium, subsequently Baltisphaeridium.
Tax. jr. synonym of the acritarch species Hystrichosphaeridium (now Goniosphaeridium) polygonale Eisenack, 1931 ex Eisenack, 1938, according to Eisenack, 1965. 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.7
Age: Early Ordovician