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Plate 19 | Swiss Journal of Palaeontology

Plate 19

From: The planktonic foraminifera of the Jurassic. Part I: material and taxonomy

Plate 19

Conoglobigerina gulekhensis (Gorbachik and Poroshina) and ? Conoglobigerina sp. Nos. 6–8 re-illustrated from Simmons et al. (1997), plate 2.6. Nos. 1, 2, 4 and 5 show poorly preserved topotypes of Conoglobigerina gulekhensis in our sample from Early Berriasian strata, Tonas River Basin, E. Crimea, Russia. Although poorly visible on the images, the wall texture is reticulate. Nos. 6, 7 and 8 are metatypes of C. gulekhensis of Early Berriasian age, village of Ugakh, SE Caucasus, Azerbijan, deposited in the Geological Faculty of Moscow, State University, Russia. Nos. 6 and 7 appear more like Globuligerina tojeiraensis; for discussion see text on Taxonomy. No. 1, side view of high spired test; no. 2, umbilical view with low arch aperture; no. 4a, side view of medium high spired test; no. 4b, umbilical view; no. 5, umbilical view; all scale bars 50 µm. No. 3. ? Conoglobigerina sp. with large last chamber, Early Berriasian, Tonas River Basin, E. Crimea, Russia; scale bar 20 µm. Nos. 6a, b, c, (×250). Specimen diameter 160 µm, spiral view, side view and umbilical view with sediment fill or partial bulla. Metatype on no. 7 with enlargement of the wall surface (dorsal side) showing pseudomuricae sometimes fusing into discontinuous, blunt ridges (×1100). Nos. 8a–c, (×235). Specimen diameter 170 µm, spiral view, peripheral view showing a convex spire and umbilical view with arched, intraumbilical aperture

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