Xanthidium tubiferum var. spiculatum White, 1844

Now Baltisphaeridium spiculatum (an acritarch species). Originally Xanthidium tubiferum var. spiculatum, subsequently Hystrichosphaeridium spiculatum, thirdly (and now) Baltisphaeridium spiculatum (an acritarch species). This taxon was raised to specific rank by Deflandre, 1937 as Hystrichosphaeridium spiculatum. Holotype: White, 1844, pl.9, fig.4
Age: Late Cretaceous