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Baltisphaeridium asteroideum
Baltisphaeridium asteroideum, (Maslov, 1956), Downie and Sarjeant, 1965
Originally Hystrichosphaera, subsequently Hystrichosphaeridium, thirdly (and now) Baltisphaeridium. This combination was not validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.
Holotype: Maslov, 1956, pl.86, fig.13
Age: Late Cretaceous
Originally Hystrichosphaera, subsequently Hystrichosphaeridium, thirdly (and now) Baltisphaeridium. This combination was not validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.
Holotype: Maslov, 1956, pl.86, fig.13
Age: Late Cretaceous