Hystrichosphaeridium heteracanthum

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"heteracanthum" Deflandre and Cookson, 1955, p.276, pl.2, figs.5–6; text-figs.40–41.  Emendation: Radmacher et al., 2014, p.33,36, as Heterosphaeridium heteracanthum.  Holotype: Deflandre and Cookson, 1955, pl.2, fig.5; Fauconnier and Masure, 2004, pl.35, figs.7–8.  NOW Heterosphaeridium.  Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium, fourthly (and now) Heterosphaeridium, fifthly Heterosphaeridium? Age: Late Cretaceous–early Eocene.

Parent: Hystrichosphaeridium

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