Sigmoilopsis schlumbergeri (Silvestri, 1904)

Symphonia, Tabita K. & Senthil, Nathan D., 2019, Taxonomic notes on Recent Foraminifera from the Continental Shelf-Slope Region of Southwestern Bay of Bengal, East Coast of India, Palaeontologia Electronica (55 A) 22 (3), pp. 1-89 : 71

Sigmoilopsis schlumbergeri (Silvestri, 1904)

Figure 21.2

1904 Sigmoilina schlumbergeri Silvestri , p. 267, pl. 7, figs. 12-14; p. 481, text-fig. 6; p. 482, text-fig. 7.

2010 Sigmoilopsis schlumbergeri (Silvestri) ; Margreth, p. 104, pl. 11, fig. 5a-c.

2012 Sigmoilopsis schlumbergeri (Silvestri) ; Milker and Schmiedl, p. 69, fig. 18.7-8.

2014 Sigmoilopsis schlumbergeri (Silvestri) ; Panchang and Nigam, pl. 14, figs. 12a-c, 13a-c.

Description. Test oval, wall porcelaneous, outer layer composed of agglutinated material, surface rough; chambers obscured, chamber arrangement sigmoidal initially, later planispirally arranged; periphery broadly rounded, sutures indistinct; aperture terminal, circular on a non-agglutinated, short neck, bordered by a weak rim, with a short tooth.

Figures

FIGURE 21. 1, Triloculina trigonula (Lamarck, 1804) in dorsal view (scale equals 300 μm). 2, Sigmoilopsis schlumbergeri (Silvestri, 1904) in dorsal view (scale equals 400 μm). 3-4, Spirosigmoilina tenuis (Cžjžek, 1848) in dorsal view (scale equals 200 μm) (3) and in apertural view (scale equals 100 μm) (4). 5, Inaequalina affixa (Terquem, 1878) in dorsal view (scale equals 400 μm). 6, Spiroloculina antillarum d’Orbigny, 1839a in dorsal view (scale equals 500 μm). 7, Spiroloculina communis Cushman and Todd, 1944 in dorsal view (scale equals 500 μm). 8, Spiroloculina costifera Cushman, 1917 in dorsal view (scale equals 500 μm). 9, Spiroloculina depressa d’Orbigny, 1826 in dorsal view (scale equals 400 μm). 10, Spiroloculina excavata d’Orbigny, 1846 in dorsal view (scale equals 200 μm). 11, Spiroloculina eximia Cushman, 1922a in dorsal view (scale equals 500 μm). 12, Spiroloculina henbesti Petri, 1955 in dorsal view (scale equals 500 μm). 13, Spiroloculina indica Cushman and Todd, 1944 in dorsal view (scale equals 500 μm). 14, Spiroloculina inflata Terquem 1882 in dorsal view (scale equals 300 μm). 15, Spiroloculina lucida Cushman and Todd, 1944 in dorsal view (scale equals 500 μm). 16. Spiroloculina neocircularis McCulloch, 1977, dorsal view (scale equals 500 μm). 17, Spiroloculina nitida d’Orbigny, 1826 in dorsal view (scale equals 500 μm). 18, Spiroloculina orbis Cushman, 1921 in dorsal view (scale equals 500 μm). 19, Spiroloculina sp. in dorsal view (scale equals 400 μm).