Reticulophragmium rotundidorsatum ( Hantken, 1875 )

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 rotundidorsatum ( Hantken, 1875)

Figure 21.8-10

1875 Haplophragmium rotundidorsatum ; Hantken, p. 12-13, pl. 1, fig. 2.

1994 Reticulophragmium rotundidorsatus (von Hantken) ; Schröder-Adams and McNeil, p. 41, pl. 8, figs. 5-7.

2005 Reticulophragmium rotundidorsatum (Hantken) ; Kaminski and Gradstein, p. 503, pl. 126,

figs. 1-7. 2009 Reticulophragmium rotundidorsatum (Hantken) ; Kender, Kaminski, and Jones, p. 505, pl.

9, fig. 3. Material. 139 specimens from eight samples. Description. Test free, subspheric, small to medium size, planispiral involute coil with rounded and thick periphery. Chambers increasing rapidly in size in the ultimate whorl, the last chamber, very large in size, tends to obliterate the umbilical region. Sutures straight and depressed; aperture multiples at the base of the last chamber. Wall alveolar and finely agglutinated. Distribution. Middle Eocene–late 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.