Fig. 1. The pore and its organic constituents. A: a pore in an inner chamber covered by an outer whorl, according to Leutenegger (1977), schematic, not to scale. B: Accumulation of mitochondria below a pore mouth in Bolivina sp., thus indicating the pores' main function: gas exchange. TEM micrograph of a section oblique to the surface ot the wall that exaggerates the thickness of the pore discs. The detachment of the outer lamella 2 (ouL 2) is an artifact of preparation. x 24,000. Courtesy S. Reber-Leutenegger; Hottinger, 2006; fig. 75 A-B  CC/BY-NC-SA)
- according to Hottinger (2006):
BASAL DISC - the thickened but porous extension of the median layer in the proximal pore cavity that is part of the pore plug.
Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744
Leutenegger (1977), Ultrastructure de Foraminifères perforés et imperforés ainsi que de leur symbiotes, Cahiers de Micropaléontologie, Paris, fasc. 3-1977, 52 p. + 54 pls.
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