Abstract

Several hundred specimens of Tintinnina (Protozoa, subphylum Ciliophora) have been recovered, as crushed loricas 0.09-0.30 mm long, from the Albian, Thermopolis, and Nefsy Shales and from the Cenomanian Graneros Shale in Wyoming, South Dakota, and Colorado. Of the six species, all new, five are referred to the modern genera Tintinnopsis, Codonella, and Coxliella; Dicloeopella borealis is assigned to a new genus. These are the first fossil tintinnids reported from the United States; they are younger than any fossil forms except a Quaternary species from Scandinavia. Most were associated with arenaceous benthonic Foraminifera suggestive of marginal or shallow marine environments, in contrast to the inferred deep-water Mesozoic faunas of the Mediterranean region.

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