Lophocyrtis, Haeckel, 1887 emend. Sanfilippo & Caulet, 1998

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 : 40

Lophocyrtis ex. gr. Calocyclas semipolita Clark & Campbell, 1942 ( Fig. 11I )

Calocyclas semipolita Clark & Campbell, 1942: 83 , pl. 8, figs 12, 14, 17-19.

Albatrossidium litos – Kozlova 1999: 146, pl. 30, figs 13, 14; pl. 35, fig. 3 (only).

GEOGRAPHIC DISTRIBUTION. — Of Calocyclas semipolita : California; of Lophocyrtis ex. gr. C. semipolita: Voronesh Anticline.

STRATIGRAPHIC RANGE. — Of Calocyclas semipolita : middle to latest middle Eocene ( Clark & Campbell 1942; Blueford & White 1984; Blueford 1988); of A. litos : middle Eocene ( Kozlova 1999); of Lophocyrtis ex. gr. C. semipolita : early-middle Eocene (this study).

REMARKS

The third segment of this specimen is longer than that of Calocyclas semipolita typ. and the width of the second and third segments are equal, which also makes difference between this specimen and C. semipolita typ. Kozlova (1999) did attribute the specimens (pl. 30, figs 13, 14; pl. 35, fig. 3 [only]) to Albatrossidium litos . To our point of view this definition is not correct, because the C. litos typ. has a very irregular distribution of pores on its surface comparing to C. semipolita ( Clark & Campbell 1945) .

Figures

FIG. 11. — Middle-early late Eocene Radiolarian association, Pirogovo Village, Well 510C, 44.0 m; A, B, Anthocyrtidium pupa Clark & Campbell, 1942; C, Lophocyrtis aspera (Ehrenberg, 1873); D, Clathrospyris sandellae Goll, 1980; E, Callimitra clavipes (Clark & Campbell, 1945); F, Heterosestrum formosum bispinum (Tochilina, 1972) emend.; G, Theocorys anaclasta Riedel & Sanfilippo, 1970; H, Axoprunum visendum (Kozlova, 1966); I, Lophocyrtis ex. gr. Calocyclas semipolita Clark & Campbell, 1942; J, K, Hexacontium sp.; L, Lychnocanium sp. B; M Lophocyrtis norvegiensis (Bjørklund & Kellogg, 1972); N, Lophocyrtis auriculaleporis (Clark & Campbell, 1942); O, Lychnocanium sp. A; P, Desmospyris ex. gr. anthocyrtoides Bütschli, 1882. Scale bar: 100 µm.