Spiroloculina orbis Cushman, 1921

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 : 74

Spiroloculina orbis Cushman, 1921

Figure 21.18

1921 Spiroloculina orbis Cushman , p. 403, pl. 83, fig. 3.

2009 Spiroloculina orbis Cushman ; Devi and Rajashekhar, p. 24, fig. 2j.

2013 Spiroloculina orbis Cushman ; Elakkiya and Manivannan, p. 885, fig. 7.4-5.

2014 Spiroloculina orbis Cushman ; Gandhi and Nathan, p. 924, pl. 1, fig. 4a.

Description. Test broadly ovate, planispiral, wall porcelaneous, imperforate, surface smooth; final chambers of uniform size overlapping the initial ones; periphery broadly rounded, peripheral margin carinate, sutures distinct, somewhat depressed, slightly arcuate; aperture terminal, round at the end of a carinate neck, bordered by a rim, with a small bifid 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).