Ammodiscus latus Grzybowski, 1898

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

Ammodiscus latus Grzybowski, 1898

Figure 13.12-13

1898 Ammodiscus latus ; Grzybowski, p. 282, 283, pl. 10, figs. 27, 28.

1898 Ammodiscus umbonatus ; Grzybowski, p. 283, pl. 10, figs. 29, 30.

1954 Lituotuba lata (Grzybowski) ; Geroch and Gradzinski, p. 39, tabl. 4, figs. 1, 2.

1960 Lituotuba lata (Grzybowski) ; Geroch, p. 126, pl. 4, fig. 8.

1992 Ammodiscus latus Grzybowski ; Morlotti and Kuhnt, p. 221, pl. 1, fig. 3.

2005 Ammodiscus latus Grzybowski ; Kaminski and Gradstein, p. 150, pl. 16a, figs. 1-8, pl. 16b, figs. 1-6.

2009 Ammodiscus latus Grzybowski ; Kender, Kaminski, and Jones, p. 495, pl. 1, fig. 17.

Material. 42 specimens from nine samples.

Description. Spherical proloculus followed by a single tubular chamber planispirally coiled for 4.5 whorl increasing in size gradually. Wall thick and finely agglutinated, sutures depressed. The last portion of the tubular chamber is typically uncoiled. Aperture a simple terminal opening.

Distribution. Cosmopolitan taxon described from the Eocene to Miocene ( Kender et al., 2009).

Remarks. The uncoiled stage is not visible in each specimen.

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.