Hystrichosphaera "asteroidea" Maslov, 1956, p.262, pl.86, fig.13.

NOW Baltisphaeridium asteroideum (Acritarch). Originally Hystrichosphaera asteroidea, subsequently Hystrichosphaeridium asteroideum, thirdly Baltisphaeridium hirsutoides forma asteroideum (Acritarch), fourthly (and now) Baltisphaeridium asteroideum (Acritarch).

Holotype: Maslov, 1956, pl.86, fig.13.
Age: Late Cretaceous.