Impletosphaeridium insolitum
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insolitum Eaton, 1976, p.308, pl.21, figs.5,8; text-fig.25B. Holotype: Eaton, 1976, pl.21, fig.5; Bujak et al., 1980, pl.5, fig.5; Fauconnier and Masure, 2004, pl.49, figs.5–6. Originally (and now) Impletosphaeridium, subsequently Cleistosphaeridium?. This species was retained in Impletosphaeridium by Islam (1993, p.86). Age: early-middle Eocene (see Aubry, 1986).
Parent: Impletosphaeridium