Thecosphaera Haeckel, 1881

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), Geodiversitas 24 (1), pp. 7-59 : 49

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).

Figures

FIG. 14. — A-I, Early and middle Eocene Radiolaria; A, Desmospyris anthocyrtoides (Bütschli, 1882), o/p 1, interval 35.5-39.3 m; B, Desmospyris sp. aff. anthocyrtoides Bütschli, 1882, o/p 1, interval 35.5-39.3 m; C, D, Thecosphaera magnaporulosa (Clark & Campbell, 1942), Well 510C, interval 40.0 m; E, Trypansosphaera sp. aff. Conosphaera abstrusa Moksyakova, 1970, o/p 294/7, interval 9.3 m; F, Theocyrtis litos (Clark & Campbell, 1945), o/p 294/2, interval 4.2 m; G, Theocyrtis scolopax (Ehrenberg, 1875), o/p 294/1, interval 3.2 m; H, Tholospyris acuminata Hertwig, 1879, o/p 294/6, interval 8.3 m; I, Tripodiscium sp., o/p 294/7, interval 9.3 m; J-T, middle-early late Eocene Radiolarian association from Sergeevka Village, o/p 1, interval 35.5-39.3m; J, Phormocyrtis sp. aff. embolum (Ehrenberg, 1873); K, Calocyclas extensa contracta Clark & Campbell, 1942; L, Druppatractus trichopterus Clark & Campbell, 1942; M, Pterocodon lex Sanfilippo & Riedel, 1979; N, Q, Ceratocyrtis stigi (Bjørklund, 1976); O, Amphisphaera megaxyphos megaxyphos (Clark & Campbell, 1942); P, Porodiscus sp.; R, S, Thecosphaera californica Clark & Campbell, 1942; T, Ceratocyrtis charlestonensis (Clark & Campbell, 1945). Scale bars: A, B, J-T, 100 mm; C-I, 50 µm.