Bulla

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Fig. 1. Accessory aperture in bulla of Globigerinita glutinata (Egger). SEM graph from Hottinger et alii, 1993. aca: accessory aperture; bu: bulla; ch: ordinary spiral chamber; (Hottinger, 2006; fig. 1 [1] CC/BY-NC-SA)

Definition

  • according to Hottinger (2006):

BULLA - a blister-like test element extending over the umbilicus of the ultimate whorl and covering primary, main or supplementary apertures. May have marginal accessory apertures. Present in planktic foraminifers only.


References

Hottinger, Halicz & Reiss (1993), Recent Foraminiferida from the Gulf of Aqaba, Red Sea, Opera SAZU, Ljubljana, 33, 179 p. + 230 pls.

Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744

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