Hystrichosphaeridium fimbriatum (White, 1842) Deflandre, 1946

NOW Filisphaeridium (Acritarch). Originally Xanthidium (Acritarch), subsequently Hystrichosphaeridium, thirdly Baltisphaeridium (Acritarch), fourthly Comasphaeridium (Acritarch), fifthly (and now) Filisphaeridium (Acritarch).

Holotype: White, 1842, pl.4, div.3, fig.3; Sarjeant, 1991, fig.4.2
Age: Late Cretaceous