Globigerinoides trilobus ( Reuss, 1850 )

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 : 246-247

Globigerinoides trilobus ( Reuss, 1850)

Figs 8E, 8F

Globigerina triloba: Reuss 1850: 374 , pl. 47, figs 11a–c.

Globigerinoides trilobus trilobus (Reuss) : Bolli & Saunders 1985: 196, fig. 20.15.

Globigerinoides trilobus immaturus LeRoy : Bolli & Saunders 1985: 196, fig. 20.14.

Globigerinoides sacculifer (Brady) : Saito et al. 1981: 65, pl. 17, figs 1a–d.

Globigerinoides trilobus (Reuss) : Loeblich & Tappan 1994: 107, pl. 206, figs 1–6; Basov & Krasheninnikov

1995: pl. V, figs 5–7; Bylinskaya et al. 2002: 129, pl. IV, figs 3, 4.

Test medium in size, with 3–3.5 globular chambers in the final whorl. The primary aperture is in the form of a low, quite wide symmetrical arch.

Remarks: Differs from G. sacculifer by its globular last chamber, and from G. ruber in the general chamber arrangement and the form of the primary aperture.

Distribution:A tropical species, indicative of warm-water conditions. It appears in practically all our samples, in low abundance.

Figures

Fig. 8. (A, D) Globigerinoides conglobatus (Brady, 1879), sample C; (B, C) G. conglobatus, sample 22; (E, F) Globigerinoides trilobus (Reuss, 1850), sample 22; (G, H) Globigerinoides sacculifer (Brady, 1877), sample 22; (I) G. sacculifer, sample 22.