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Baltisphaeridium palmatum

Baltisphaeridium palmatum, (Deflandre and Courteville, 1939), Downie and Sarjeant, 1965

Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly Exochosphaeridium, fourthly Exochosphaeridium?.
Tax. jr. synonym of Hystrichosphaeridium (now Pervosphaeridium) pseudhystrichodinium Deflandre, 1937 according to Yun, 1981. This combination was not validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.

Holotype: Deflandre and Courteville, 1939, pl.3, fig.1
Age: Late Cretaceous
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