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Appendix A

Xanthidium spinosum

"Xanthidium spinosum" White, 1842, p.37, pl.4, fig.6.

TYPE: Holotype: White, 1842, pl.4, fig.6.

HISTORY: NOW: Exochosphaeridium?. Originally Xanthidium, subsequently Hystrichosphaeridium, thirdly Baltisphaeridium (Appendix A), fourthly Cordosphaeridium (combination not validly published), fifthly Exochosphaeridium, sixthly (and now) Exochosphaeridium?.

AGE: Late Cretaceous.


Infraspecific taxa:


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