Radiolaria from the lower Cenomanian (Upper Cretaceous) of Crimea. Part 2. Nassellaria

Abstract

Well-preserved Late Cretaceous (early Cenomanian) radiolarians were recovered from two sections in Crimea: Bodrak River and Sel’-Bukhra Mountain. Abundant and diverse Nassellaria were studied and four new species are described: Holocryptocanium pseudoastiense nov. sp., Diacanthocapsa bodrakiense nov. sp., Novixitus riedeli nov. sp. and Rhopalosyringium panovi nov. sp. Herein Archaeodictyomitra (?) speciosa Bragina is newly attributed to the genus Obeliscoites O’Dogherty and Dorypyle ovoidea (Squinabol) is tentatively attributed to the genus Homeoarchicorys Empson-Morin. The stratigraphic ranges of Diacanthocapsa urkutica Bragina, Distylocapsa squama O’Dogherty, Novixitus subtilis Bragina, and Siphocampe altamontensis (Campbell and Clark) are more precisely defined with their lower limits expanded to the lower Cenomanian and the upper limits of Pseudodictyomitra languida O’Dogherty and Thanarla conica (Squinabol) extended to the lower Cenomanian.