Pterocodon ampla longispina ( Clark & Campbell, 1942 )

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 longispina ( Clark & Campbell, 1942) n. comb. ( Fig. 9C, D )

Clathrocyclas universa longispina Clark & Campbell, 1942: 88 , pl. 7, fig. 15.

Clathrocyclas extensa – Kozlova 1999: pl. 14, fig. 6.

GEOGRAPHIC DISTRIBUTION. — California, western Siberia, Russian Platform, southern part.

STRATIGRAPHIC RANGE. — Early Eocene to latest middle Eocene, ( Clark & Campbell 1942; Blueford & White 1984; Blueford 1988; Kozlova 1999); (?)late Paleocene-early Eocene (this study).

REMARKS

The first and second segments of Clathrocyclas universa longispina are similar to Pterocodon ampla , but the third segment is different, its diameter is 1.1 to 1.2 time bigger than that of the second segment and it is what we observed for C. universa longispina . Thus the new combination of a species and subspecies names will be more correct according to the taxonomic priority.

Figures

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.