Baltisphaeridium heteracanthum Appendix A
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"heteracanthum" (Deflandre and Cookson, 1955, p.276, pl.2, figs.5–6; text-figs.40–41) Downie and Sarjeant, 1965, p.91. 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: Baltisphaeridium_Appendix A