Hystrichosphaeridium spinosum
From dinoflaj3
"spinosum" (White, 1842, p.37, pl.4, fig.6) Lejeune-Carpentier, 1941, p.B76. Holotype: White, 1842, pl.4, fig.6; lost according to Sarjeant (1966b, p.141). NOW Exochosphaeridium?. Originally Xanthidium (Appendix A), subsequently Hystrichosphaeridium, thirdly Baltisphaeridium (Appendix A), fourthly Cordosphaeridium (combination not validly published), fifthly Exochosphaeridium, sixthly (and now) Exochosphaeridium?. Age: Late Cretaceous.
Parent: Hystrichosphaeridium
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