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Baltisphaeridium mariannae
Baltisphaeridium mariannae, (Philippot, 1949), Downie and Sarjeant, 1965
Now Achomosphaera. Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly (and now) Achomosphaera. This combination was not validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.
Holotype: Philippot, 1949, text-fig.2
Age: Late Cretaceous
Now Achomosphaera. Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly (and now) Achomosphaera. This combination was not validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.
Holotype: Philippot, 1949, text-fig.2
Age: Late Cretaceous