Abstract:
Three new radiolarian species, Heliodiscus borealis sp. nov., Spongasteriscus rozanovi sp. nov., and Prunopyle stanislavi sp. nov., from the Upper Cretaceous deposits of the Koryak Upland are described. The species were collected in the lower Campanian inoceramid Pennatoceramus orientalis Zone of the Vatyna River basin, where radiolarians occur together with foraminifers. The stratigraphic ranges of the genera Heliodiscus, Spongasteriscus, and Prunopyle, which previously were thought to be restricted to the Cenozoic, are extended into the Cretaceous.
