Ammodiscus sp. 3

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 : 26

Ammodiscus sp. 3

Figure 13.19

Material. One single specimen from the sample PC060603.

Description. Test free, planispirally coiled, strictly biconcave, evolute with partially embraced whorls. The tubular chamber completes 11 whorls around the axis. Wall thin, finely agglutinated. Aperture single at the end of the chamber.

Remarks. Differs from Ammodiscus sp. 2 in having a higher number of whorls, and smaller size.

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.