Quasicrolanium planocephala ( Kozlova, 1976 )

Vishnevskaya, Valentina S. & Kozlova, Genrietta E., 2012, Volgian and Santonian-Campanian radiolarian events of the Russian Arctic and Pacific Rim, Acta Palaeontologica Polonica 57 (4), pp. 773-790 : 789

Quasicrolanium planocephala ( Kozlova, 1976)

Fig. 6A .

1976 Stichopilidium planocephala ; Kozlova 1976: 82, fig. 3.

1983 Stichopilidium planocephala Kozlova, 1976 ; Kozlova 1983: 81–82, fig. 3.

1994 Pseudocrolanium planocephala ( Kozlova, 1976) ; Kozlova 1994b: pl. 8: 1–3.

1999 Quasicrolanium planocephala ( Kozlova, 1976) ; Repin et al. 1999: 36.

Remarks.—Originally, Kozlova (1994) planned to describe a new genus, Pseudocrolanium ( Kozlova 1994a) and referred to the present species as Pseudocrolanium planocephala (Kozlova, 1994) Kozlova, 1994 . However, the genus Pseudocrolanium Jud, 1994 ( Jud 1994: 96) differs in having nodular ridges, three radially protruding spines only in the distal part of the test and longitudinal costae along central part of test.

Figures

Fig. 6. Scanning electron photomicrographs of Late Jurassic radiolarians from siliceous clay rocks in northern Russia, Barents Sea region. A–F from Kozlova (1994b). A. Quasicrolanium planocephala (Kozlova, 1976), uppermost Volgian, Kolguev offshore, borehole 140, sample 140, VNIGRI N 140−667/41a. B–E. Spinicingula ceratina Kozlova and Vishnevskaya sp. nov. B, C. From Narjan−Mar, borehole 5, Upper Volgian, sample 5. B. Holotype, VNIGRI N 667/66. C. VNIGRI N 667/66−1. D, E. From Upper Volgian, Gorodishce section (Craspedites subditus ammonite Zone) of Uljanovsk Volga Basin, sample G2. D. GIN N G−R1−1. E. GIN N G−R1−2. F, G. Parvicingula alata Kozlova and Vishnevskaya sp. nov., Middle Volgian, Gorodishce section (Dorsoplanites panderi Ammonite Zone) of Uljanovsk Volga Basin, sample G1. F. Holotype, GIN N G−1−2Ka. G. GIN N G−1−3K. H. Parvicingula papulata Kozlova and Vishnevskaya sp. nov., holotype, GIN N P−1K. Pechora Basin, Ukhta section, sample P, Lower Kimmeridgian. Scale bars 50 µm.