Xanthidium spinosum Appendix A
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"spinosum" White, 1842, p.37, pl.4, fig.6. Holotype: White, 1842, pl.4, fig.6; lost according to Sarjeant (1966b, p.141). 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.
Parent: Xanthidium_Appendix A