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Polysphaeridium simplex
Polysphaeridium? simplex (White, 1842) Davey and Williams, 1969
Now Dapsilidinium simplex. Originally Xanthidium tubiferum var. simplex (a desmid varietas), subsequently Xanthidium simplex (a desmid species), thirdly Hystrichosphaeridium simplex, fourthly Polysphaeridium? simplex, fifthly (and now) Dapsilidinium simplex. At the time of the transfer, Davey and Williams, 1969 questionably included this species in Polysphaeridium. Stover and Evitt, 1978 considered this to be a "problematical species" of Polysphaeridium. This combination was not validly published in Davey and Williams, 1966, since these authors did not fully reference the basionym. Davey and Williams, 1966 questionably included the species in Polysphaeridium.
Holotype: White, 1842, pl.4, fig.10
Age: Late Cretaceous
Now Dapsilidinium simplex. Originally Xanthidium tubiferum var. simplex (a desmid varietas), subsequently Xanthidium simplex (a desmid species), thirdly Hystrichosphaeridium simplex, fourthly Polysphaeridium? simplex, fifthly (and now) Dapsilidinium simplex. At the time of the transfer, Davey and Williams, 1969 questionably included this species in Polysphaeridium. Stover and Evitt, 1978 considered this to be a "problematical species" of Polysphaeridium. This combination was not validly published in Davey and Williams, 1966, since these authors did not fully reference the basionym. Davey and Williams, 1966 questionably included the species in Polysphaeridium.
Holotype: White, 1842, pl.4, fig.10
Age: Late Cretaceous