Baltisphaeridium densicomatum (Maier, 1959, p.307–308, pl.29, figs.7–8) Gerlach, 1961, p.193; Emendation: Sarjeant, 1983, p.111–113, as Sentusidinium densicomatum.

Now Impletosphaeridium?. Originally Galea (an illegitimate generic name), subsequently Baltisphaeridium, thirdly Impletosphaeridium, fourthly (and now) Impletosphaeridium?, fifthly Sentusidinium.

Holotype: Maier, 1959, pl.29, fig.7
Age: Middle Oligocene-middle Miocene