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Exochosphaeridium spinosum
Exochosphaeridium spinosum (White, 1842) Davey, 1969
Originally Xanthidium (acritarch), subsequently Hystrichosphaeridium, thirdly Baltisphaeridium (acritarch), 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.
Holotype: White, 1842, pl.4, fig.6; lost according to Sarjeant (1966b, p.141).
Age: Late Cretaceous
Originally Xanthidium (acritarch), subsequently Hystrichosphaeridium, thirdly Baltisphaeridium (acritarch), 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.
Holotype: White, 1842, pl.4, fig.6; lost according to Sarjeant (1966b, p.141).
Age: Late Cretaceous