Spiroplectammina sagittula (Defrance, 1824)

Figure 3.13

1824 Textularia sagittula Defrance, p. 177, pl. 13, fig. 5-5a.

2003 Textularia sagittula (Defrance); Murray, p. 15, fig. 3.12-14.

2006 Spiroplectinella sagittula (d’Orbigny); Oflaz, p. 129, pl. 1, fig. 2.

Description. Test elongate, slightly compressed laterally, outline subtriangular, wall agglutinated, surface smooth; chambers biserially arranged, gradually increasing in size as added; periphery subacute, sutures curved, slightly depressed; aperture terminal, low arched opening, bordered by a lip.