Hystrichosphaeridium asperum Maier, 1959; Emendation: Sarjeant, 1983, p.113-114, as Polysphaeridium asperum.

Now Polysphaeridium. Originally Hystrichosphaeridium, subsequently Polysphaeridium?, thirdly Dapsilidinium, fourthly (and now) Polysphaeridium.

Holotype: Maier, 1959, pl.33, fig.2
Age: Middle Miocene