Hystrichosphaeridium sergipense
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?sergipense (Regali et al., 1974, p.291, pl.24, fig.1) Lentin and Williams, 1981, p.147. Holotype: Regali et al., 1974, pl.24, fig.1. Originally Hystrichosphaera, subsequently (and now) Hystrichosphaeridium?. Questionable assignment: Lentin and Williams (1981, p.147); and Masure and Foucher in Fauconnier and Masure (2004, p.313) as a problematic species. Age: early Eocene.
Parent: Hystrichosphaeridium