Reticulophragmium amplectens ( 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 : 46

Reticulophragmium amplectens ( Grzybowski, 1898)

Figure 21.4-7

1898 Cyclammina amplectens ; Grzybowski, p. 292, pl. 12, figs. 1-3.

1954 Cyclammina amplectens Grzybowski ; Geroch and Gradzinski, p. 39-40, tab. IV, figs. 10-13, tab. V, fig. 10a-d.

1992 Reticulophragmium amplectens (Grzybowski) ; Morlotti and Kuhnt, p. 223, pl. 4, figs. 9-11.

2005 Reticulophragmium amplectens (Grzybowski) ; Kaminski and Gradstein, p. 491, pl. 123, figs. 1-6.

Material. 18 specimens from four samples.

Description. Test free, biconvex, planispiral involute coil, with acute periphery and depressed umbilicus. Initial chambers are triangular and without alveoles which appear in the adult stage, simple and not branched.

Distribution. Eocene–Oligocene of the Thethys

( Kaminski and Gradstein, 2005); signaled from the

Miocene of the Greenland Sea ( Osterman and

Spiegler, 1996).

Figures

FIGURE 21. Scanning electron micrographs of Cyclamminidae from the Caltavuturo Formation cropping out at Portella Colla. 1-3, Reticulophragmium acutidorsatum (Hantken, 1868), PC3. 4-7, Reticulophragmium amplectens (Grzybowski, 1898), PC3. 8-10, Reticulophragmium rotundidorsatum (Hantken, 1875), PC060624. 11-12, Cyclammina cancellata Brady, 1879, PC22. 13-14, Reticulophragmium projectum Schröder-Adams and McNeil, 1994, PC060624. 15, Cyclammina placenta (Reuss, 1851), PC11. Scale bar equals 0.5 mm.