Trifarina angulosa (Williamson, 1858)

Figure 9.23

1858 Uvigerina angulosa Williamson, p. 67, pl. 5, fig. 140.

2003 Trifarina angulosa (Williamson); Murray, p. 26, fig. 10.5.

2010 Angulogerina angulosa (Williamson); Margreth, p. 118, pl. 29, fig. 6a-b.

2012 Trifarina angulosa (Williamson); Debenay, p. 182.

2012 Angulogerina angulosa (Williamson); Milker and Schmiedl, p. 90, fig. 21.2-4.

2014 Angulogerina angulosa (Williamson); Panchang and Nigam, pl. 27, fig. 22.

Description. Test elongate, cross section triangular, wall calcareous, perforate, surface ornamented with thick, long striae; initial chamber arrangement triserial, later biserially arranged; periphery carinate, sutures limbate and depressed; aperture terminal, ovate, at the end of a short neck, bordered by a rim.