Globigerinoides bulloideus Crescenti, 1966

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 : 243-244

Globigerinoides bulloideus Crescenti, 1966

Figs 7C, 7F

Globigerinoides bulloideus: Crescenti 1966: 43 , pl. 9, figs 9a–c; Bolli & Saunders 1985: 194, fig. 20.9.

Test medium trochospiral, well lobulated, with 4 spherical chambers in the final whorl slowly increasing in size. Primary aperture umbilical, interiomarginal, a wide arch with very thin lip; only one small supplementary aperture.

Remarks: The test of this species is very similar to that of Globigerina bulloides , and it is normally characterized by a wide primary aperture ( Bolli & Saunders 1985). Our specimen has an atypically small primary aperture with a thin lip, similar to that of Globigerina falconensis . However, it differs from both G. bulloides and G. falconensis in having a supplementary aperture. G. bulloideus differs from Globigerinoides tenellus in being larger and in having slowly increasing non-embracing chambers.

Distribution: Known from the Middle Miocene of Italy ( Bolli & Saunders 1985). Temperate waters, found in Atlantic Quaternary cores (Bylinskaya, unpubl. data). Very rare, two specimens in our material.

Figures

Fig. 7. (A, D) Globigerinella siphonifera (d’Orbigny, 1839), sample 26; (B, E) G. siphonifera, another specimen from sample 26; (C, F) Globigerinoides bulloideus Crescenti, 1966, sample 30; (G–I) Globigerinoides tenellus Parker, 1958, sample 6.