Abstract:
The representative radiolarian assemblage different in taxonomy from all known coeval assemblages of Sakhalin was discovered in the basal beds of the Lower Krasnoyarka Subformation of the upper Campanian in the Susuya River basin of southwestern Sakhalin. It appeared to be hardly correlative with coeval assemblages from adjacent and remote areas. The article presents descriptions of the new genus Bipylomella gen. nov. and new species Bipylomella sachalinica sp. nov., Hexaloche (?) horridus sp. nov., and Spongostaurus (?) sachalinensis sp. nov..
