Impletosphaeridium giganteum
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"giganteum" (Caro, 1973, p.360–361, pl.2, fig.12) Islam, 1993, p.86. Holotype: Caro, 1973, pl.2, fig.12; Fauconnier and Masure, 2004, pl.49, figs.13–14. NOW Exochosphaeridium. Originally Polysphaeridium, subsequently Cleistosphaeridium, thirdly Impletosphaeridium, fourthly (and now) Exochosphaeridium. Age: early Eocene.
Parent: Impletosphaeridium