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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
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