New locality of the Campanian radiolarians in southwestern Sakhalin

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