Cyclammina placenta ( Reuss, 1851 )

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 : 46-48

Cyclammina placenta ( Reuss, 1851)

Figure 21.15

1851 Nonionina placenta ; Reuss, p. 72, pl. 5, fig. 33.

1981 Cyclammina placenta Reuss ; Gradstein and Berggren, p. 254, pl. 7, figs. 4-8.

1989 Reticulophragmium placenta (Reuss) ; Kaminski, Gradstein, and Berggren, pl. 5, fig. 3a-b.

2005 Cyclammina placenta (Reuss) ; Kaminski and Gradstein, p. 480, pl. 119, figs. 1-6.

Material. Eight specimens from four samples.

Description. Test free, flattened and narrow, planispiral coil with acute periphery. The number of chambers in the last whorl is variable and dependent to the dimension of the test. Sutures sigmoidal.

Distribution. Eocene–Miocene ( Kaminski and Gradstein, 2005).

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.