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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)


  • 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.


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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