Ammodiscus peruvianus Berry, 1928

Benedetti, A, 2017, Eocene / Oligocene deep-water agglutinated foraminifers (DWAF) assemblages from the Madonie Mountains (Sicily, Southern Italy), Palaeontologia Electronica 20 (1), pp. 1-66 : 25-26

Ammodiscus peruvianus Berry, 1928

Figure 13.14

1928 Ammodiscus peruvianus ; Berry, p. 342, pl. 27.

1954 Ammodiscus grzybowski ; Emiliani, p. 106.

2006 Ammodiscus peruvianus (Berry) ; Kaminski,

Silye, and Kender, p. 382, pl. 1, fig. 20.

Material. Five specimens in the sample PC060617.

Description. Test free, elliptical in outline, composed of a single chambers planispirally coiled. Wall thin, finely agglutinated. Aperture terminal.

Distribution. Cosmopolitan species common from the Cretaceous to the Eocene, and signaled from the Oligocene of the northern Appennines ( Emiliani, 1954), and from the Miocene of Greenland Sea ( Kaminski et al., 2006).

Remarks. Ammodiscus peruvianus differs from A. cretaceus for the elliptical outline.

Figures

FIGURE 13. Scanning electron micrographs of Psammosphaeridae (1-4) and Ammodiscidae (5-27) from the Caltavuturo Formation cropping out at Portella Colla. 1, Psammosphaera cf. laevigata White, 1928, PCs0. 2, Psammosphaera sp. 1, PC13. 3, Psammosphaera sp. 2, PC060615. 4, Psammosphaera sp. 3, PC060625. 5, Ammodiscus cretaceus (Reuss, 1845), PC22. 6, Hyperammina sp., PC060625. 7-8, Ammodiscus incertus (d’Orbigny, 1839), PC060603 (7) and PC13 (8). 9-11, Ammodiscus tenuisimus (Gümbel, 1862), PC22 (9), PC060615 (10) and PC060615 (11). 12-13, Ammodiscus latus Grzybowski, 1898, PC11 (12) and PC11 (13). 14, Ammodiscus peruvianus Berry, 1928, PC060617. 15-16, Ammodiscus cf. latus Grzybowski, 1898, PC11. 17, Ammodiscus sp. 1, PC11. 18, Ammodiscus sp. 2, PC15. 19, Ammodiscus sp. 3, PC060603. 20, Annectina biedai Gradstein and Kaminski, 1997, PC060618. 21, Annectina cf. grzybowski (Jurkiewicz, 1960), PC060617. 22, Glomospira sp. 2, PC15. 23, Glomospira sp. 1, PC11. 24, Glomospira sp. 3, PC13. 25-26. Glomospira serpens (Grzybowski, 1898), PC060617 (25) and PC060618 (26). 27, Glomospira irregularis (Grzybowski, 1898), PC060618. Scale bar equals 0.5 mm.