Exochosphaeridium spinosum
From dinoflaj3
?spinosum (White, 1842, p.37, pl.4, fig.6) Davey 1969a, p.166. Holotype: White, 1842, pl.4, fig.6; lost according to Sarjeant (1966b, p.141). Originally Xanthidium (Appendix A), subsequently Hystrichosphaeridium, thirdly Baltisphaeridium (Appendix A), fourthly Cordosphaeridium (combination not validly published), fifthly Exochosphaeridium, sixthly (and now) Exochosphaeridium?. Questionable assignment: Stover and Evitt (1978, p.154). Sarjeant (1966b, p.141) speculated that this species might be the senior synonym of Hystrichodinium pulchrum. Age: Late Cretaceous.
Parent: Exochosphaeridium
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