Triloculina trigonula (Lamarck, 1804)

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

Triloculina trigonula (Lamarck, 1804)

Figure 21.1

1804 Miliolites trigonula Lamarck , p. 351, pl. 17, fig. 4a-c.

2006 Triloculina trigonula (Lamarck) ; Oflaz, p. 177, pl. 4, fig. 4.

2007 Triloculina trigonula (Lamarck) ; Talib and Farroqui, p. 19, pl. 1, fig. 16a-b.

2010 Triloculina trigonula (Lamarck) ; Margreth, p. 103, pl. 11, fig. 2a-c.

2012 Triloculina trigonula (Lamarck) ; Debenay, p. 138.

2014 Triloculina trigonula (Lamarck) ; Panchang and Nigam, pl. 13, fig. 7a-b.

Description. Test subtriangular, slightly longer than broad, wall calcareous, imperforate, surface smooth; chambers inflated, chamber arrangement triloculine; periphery broadly convex with smooth angles, sutures distinct; aperture terminal, narrow, elongate opening, bordered by a thick rim, with a broad, 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).