Impletosphaeridium williamsii

williamsii (Boltenhagen, 1977, p.41–42, pl.2, figs.6–7) Islam, 1993, p.87.  Holotype: Boltenhagen, 1977, pl.2, fig.6; Fauconnier and Masure, 2004, pl.50, fig.6.  Originally Polysphaeridium, subsequently Cleistosphaeridium, thirdly (and now) Impletosphaeridium.  Age: Cenomanian–early Turonian.

Parent: Impletosphaeridium