Globigerinella siphonifera (d’Orbigny, 1839a)

Figure 13.14-16

1839a Globigerina siphonifera d’Orbigny, p. 83, pl. 4, figs. 15-18.

1983 Globigerinella aequilateralis (Brady); Kennett and Srinivasan, p. 238, pl. 59, fig. 1; pl. 60, figs. 4-6.

2010 Globigerinella siphonifera (d’Orbigny); Ovechkina, Bylinskaya, and Uken, p. 244, fig. 7A, 7B, 7D, 7E.

Description. Test large, wall perforate, surface ornamented with round spines; chambers spherical initially, globular or ovoid in the final stage, chamber arrangement nearly planispiral, coiling involute; periphery rounded, sutures distinct and depressed; aperture high, symmetrical, equatorial arch.