Globigerinella calida (Parker, 1962)

Ovechkina, Maria N., Bylinskaya, Marina E. & Uken, Ron, 2010, Planktonic foraminiferal assemblage in surface sediments from the Thukela Shelf, South Africa, African Invertebrates 51 (2), pp. 231-231 : 242-243

Globigerinella calida (Parker, 1962)

Figs 6G–I

Globigerina calida: Parker 1962: 221–222 , pl. 1, figs 9–13, 15; 1967: 149, pl. 18, fig. 11, 12 (not figs 6–10); Bé 1967: 3, figs 15a–c; Cimerman & Langer 1991: 57, pl. 60, figs 2, 3.

Globigerina calida calida Parker : Blow 1969: 317, pl. 13, figs 9, 10; Bolli & Saunders 1985: 256, fig. 5.13; Basov & Krasheninnikov 1995: pl. IV, figs 7–9; Bylinskaya et al. 2002: 126, pl. II, figs 1–3.

Globigerinella calida (Parker) : Saito et al. 1976: 282, pl. 1, fig. 2; pl. 6, fig. 2; pl. 8, fig. 1; 1981: 32, pl. 4, figs 2a–d; Loeblich & Tappan 1994: 106, pl. 201, figs 7–11; pl. 202, figs 1–10.

Size variable. Low trochospiral test with about 4 initially spherical to slightly radially elongate chambers. Embracing loose so that the final chamber is almost completely detached from the previous whorl and the aperture is visible from the lateral and even spiral side (appears as slit); sutures deep. The aperture is developed as a large umbilical arch. Remarks: Differs from Globigerina bulloides in loose embracing, radial elongation of the final chambers, visible aperture (slit) on the spiral side, and in having a thinner and less hispid wall. It also differs from juvenile trochoid Globigerinella siphonifera in having less involute chambers and a less hispid surface of the wall.

Distribution: G. calida appears in most of the climatic areas from equatorial to temperate, but is never abundant in assemblages ( Bylinskaya et al. 2002). This species is rare in our material.

Figures

Fig.6. (A–C) Globigerina falconensis Blow, 1959, sample 30; (D–F) Globigerina rubescens Hofker,1956, sample 25; (G–I) Globigerinella calida (Parker, 1962), sample 4.