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Baltisphaeridium spiculatum

Baltisphaeridium spiculatum, (White, 1844), Downie and Sarjeant, 1965

Originally Xanthidium tubiferum var. spiculatum (a desmid varietas), subsequently Hystrichosphaeridium spiculatum, thirdly (and now) Baltisphaeridium spiculatum. This combination was not validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.

Holotype: White, 1844, pl.9, fig.4
Age: Late Cretaceous
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