Pterocodon ampla ( Brandt, 1936 )

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 : 47

Pterocodon ampla ( Brandt, 1936) ( Figs 7E, F ; 9I, J )

Theocyrtis ampla Brandt, 1936: 56 , pl. 9, figs 13-15.

Pterocodon ampla – Foreman 1973: 438. — Sanfilippo & Riedel 1979: 505, pl. 1, figs 7, 8. — Sanfilippo et al. 1985: 680, pl. 1, figs 7, 8. — Khokhlova et al. 1994: 229, pl. 13.6, fig. 8.

Clathrocyclas ampla – Kozlova 1999: 118 (not pl. 18, fig. 1); pl. 21, fig. 16; pl. 44, fig. 14.

Clathrocyclas elegans – Kozlova 1999: pl. 15, fig. 9; pl. 18, fig. 2.

GEOGRAPHIC DISTRIBUTION. — Cosmopolite species.

STRATIGRAPHIC RANGE. — Ranges across Paleocene- Eocene boundary ( Sanfilippo et al. 1985); early Eocene ( Kozlova 1990, 1999); middle Eocene ( Khokhlova et al. 1996); (?)late Paleocene-early Eocene (this study).

REMARKS

This species is very similar to Clathrocyclas angusta (see Kozlova 1990: pl. XII, fig. 9; 1999, pl. 14, fig. 1) the only difference we observed is irregular size of pores (second row) perforated the upper part of the third segment.

Figures

FIG. 7. — Early Eocene Radiolarian association, Petropavlovka Village, well 730, interval 44,3 m; A, B, Petalospyris sp. aff. argiscus Ehrenberg,1875; C, D, Petalospyris (?) sp.;E, F, Pterocodon ampla (Brandt,1936); G, Lychnocanoma bellum longipes (Kozlova,1966); H, Podocyrtis cf. papalis Ehrenberg, 1875; I, Lychnocanoma sp. aff. bandyca Mato & Theyer, 1980; J, Cycladophora cf. Pterocorys bicornis Popofsky, 1908; K, Lithostrobus picus (Ehrenberg,1875); L, Amphisphaera megaxyphos trixyphos (Clark & Campbell, 1942); M, Amphymenium splendiarmatum Clark & Campbell, 1942; N, Clathrocyclas ex. gr. universa Clark & Campbell, 1942; O, Prunopyle sp. aff. ovata Kozlova, 1966; P, Plectodiscus circularis (Clark & Campbell, 1942); Q, Petalospyris argiscus Ehrenberg, 1875; R, Anthocyrtidium sp. aff.pupa Clark & Campbell, 1942;S, Ommatogramma biconstrictus (Lipman,1953).Scale bars:100 µm.

FIG. 9. — Early Eocene Radiolarian association, Petropavlovka Village, Well 730-C, interval 44.3 m; A, B, F, G, Phormocyrtis sp. aff. proxima Clark & Campbell, 1942; C, D, Pterocodon ampla longispina (Clark & Campbell, 1942) n. comb.; E, Lithostrobus picus (Ehrenberg, 1875); H, Pterocodon ex. gr. ampla (Brandt, 1936); I, J, Pterocodon ampla (Brandt, 1936); K, L(?), Petalospyris tumidula Kozlova, 1966; M, N, Phormocyrtis sp.; O, P, Rhopalocanium pyramis (Haeckel, 1887); Q, Rhopalocanium satelles (Kozlova, 1966); R-T, Dictyoprora urceolus Haeckel, 1887; U, V, Petalospyris sp. aff. septenaria Kozlova, 1966; W, Lychnocanoma cf. bellum Clark & Campbell; X, Y, Mita cf. regina (Campbell & Clark, 1944). Scale bars: 100 µm.