Dapsilidinium asperum (Maier, 1959) Bujak et al., 1980

Now Polysphaeridium. Originally Hystrichosphaeridium, subsequently Polysphaeridium?, thirdly Dapsilidinium, fourthly (and now) Polysphaeridium.
Sarjeant, 1983, emended the diagnosis of this species and retained it in Polysphaeridium Davey and Williams, 1966 without question.
Holotype: Maier, 1959, pl.33, fig.2
Age: Middle Miocene