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Baltisphaeridium armatum
Baltisphaeridium armatum, (Deflandre, 1937), Downie and Sarjeant, 1965
Now Cleistosphaeridium. Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly (and now) Cleistosphaeridium. This combination was not validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.
Holotype: Deflandre, 1937, pl.16 [al. pl.13], fig.6
Age: Late Senonian
Now Cleistosphaeridium. Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly (and now) Cleistosphaeridium. This combination was not validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.
Holotype: Deflandre, 1937, pl.16 [al. pl.13], fig.6
Age: Late Senonian