Fig. 7 in Volgian and Santonian-Campanian radiolarian events of the Russian Arctic and Pacific Rim

Fig. 7. Scanning electron micrographs of Late Cretaceous (Early Campanian) radiolarians from siliceous rocks of the Russian Arctic Margin (western Siberia, borehole 22, Ust−Manja, sample 57), except for D which is from the Volga Basin, Uljanovsk region, Shilovka section, sample 7−1. A–C. Spongurus arcticus Kozlova and Vishnevskaya sp. nov. A. Holotype, GIN N K22−2−57. B. GIN N K22−2a−57. C. GIN N K22−2b−57. D–F. Prunobrachium articulatum (Lipman, 1952). D. GIN N K22−15a−57. E. GIN N K22−15b−57. F. GIN N K22−15c−57. G, K–N. Lithostrobus ex gr. rostovzevi Lipman, 1960. G. GIN N K22−1a−57/1. K. GIN N K22−1b−57/1. L. GIN N K22−1c−57/2. M. GIN N K22−1c−57. N. GIN N K22−1d−57. H–J. Lithostrobus borealis Kozlova and Vishnevskaya sp. nov. H. GIN N K22−1a−57. I. GIN N K22−1b−57. J. Holotype, GIN N K22−1−57. O. Lithostrobus longus Grigorieva, 1975; GIN N K22−11−57. P–R. Immersothorax marinae (Gorbovets, 1966). P. GIN N K22−12−57. Q. GIN N K22−12a−57. R. GIN N K22−12b−57. S. Amphipyndax stocki (Campbell and Clark, 1944), GIN N K22−13−57.