Xanthidium fimbriatum White, 1842

Now Comasphaeridium (an acritarch genus). Originally Xanthidium, subsequently Hystrichosphaeridium, thirdly Baltisphaeridium (an acritarch genus), fourthly (and now) Comasphaeridium (an acritarch genus).
Holotype: White, 1842, pl.4, div.3, fig.3; Sarjeant, 1991, fig.4.2
Age: Late Cretaceous