Spiroloculina costifera Cushman, 1917

Figure 21.8

1917 Spiroloculina costifera Cushman, p. 34, pl. 6, figs. 1-3.

2014 Spiroloculina costifera Cushman; Babu et al., p. 79, pl. 1, fig. 6.

2014 Spiroloculina costifera Cushman; Gandhi and Nathan, p. 924, pl. 1, fig. 3a.

Description. Test large, subcircular, compressed laterally, wall porcelaneous, imperforate, surface smooth, final chambers ornamented with long costae; chambers arcuate, final chamber slightly detached from the earlier chambers; peripheral margin highly carinate, sutures distinct, slightly depressed; aperture terminal, rounded at the end of a carinate neck, bordered by a rim with a bifid tooth.