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Genus Thecosphaera Haeckel, 1881 Thecosphaera californica Clark & Campbell, 1942 (Fig. 14R, S) Thecosphaera californica Clark & Campbell, 1942: 22, pl. 4, fig. 7; 1945: 10, pl. 1, fig. 10. — Blueford & White 1984: pl. 3, fig. 5. — Blueford 1988: 247, pl. 3, figs 10-12. Thecosphaera californica sumensis Gorbunov, 1979: 91, pl. 12, fig. 1a-b. GEOGRAPHIC DISTRIBUTION. — California, Russian Platform, southern part. STRATIGRAPHIC RANGE. — Middle to latest middle Eocene (Clark & Campbell 1942, 1945; Blueford & White 1984; Blueford 1988); middle Eocene (Khokhlova 1996); late Eocene, Kievsky Group (Gorbunov 1979); early-middle Eocene (this study)., Published as part of Popova, Irina M., Baumgartner, Peter O., Guex, Jean, Tochilina, Svetlana V. & Glezer, Zoya I., 2002, Radiolarian biostratigraphy of Paleogene deposits of the Russian Platform (Voronesh Anticline), pp. 7-59 in Geodiversitas 24 (1) on page 49, DOI: 10.5281/zenodo.5375608, {"references":["HAECKEL E. 1881. - Entwurf eines Radiolarien- Systems auf Grund von Studien der Challenger- Radiolarien (Basis for a radiolarian classification from the study of Radiolaria of the Challenger collection). Jenaische Zeitschrift fur Naturwissenschaft 15: 418 - 472.","CLARK B. L. & CAMPBELL A. S. 1942. - Eocene radiolarian faunas from the Mount Diablo area, California. Geological Society of America, Special Papers 39: 1 - 112.","BLUEFORD J. R. & WHITE L. D. 1984. - Paleoceanographic interpretation of Eocene siliceous deposits from west-central California, in BLUEFORD J. R. (ed.), Kreyenhagen Formation and Related Rocks. Pacific Section, Society of economic Paleontologists and Mineralogists, Los Angeles: 67 - 78.","BLUEFORD J. 1988. - Radiolarian biostratigraphy of siliceous Eocene deposits in central California. Micropaleontology 34 (3): 236 - 258.","GORBUNOV V. S. 1979. - Radiolyarii srednego i verkhnego eotsena Dneprovsko-Donetskoy vpadiny [= Radiolaria of the middle and upper Eocene of the Dnieper-Donets Basin]. [s. n.], [s. l.], 164 p.","CLARK B. L. & CAMPBELL A. S. 1945. - Radiolaria from the Kreyenhagen Formation near Los Banos, California. Geological Society of America 101 (i-vii): 1 - 66.","KHOKHLOVA I. E. 1996. - Paleogenovie radiolarii Ushnoi Rosii: taxonomicheskii sostav i paleoecologicheskie reconstruksii. Stratigrafia, Geologicheskaya korrelasiya 4: 53 - 61."]}