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.