Fig. 1. The pore and its organic constituents. 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. Abbreviations: bD: basal (pore) disc; Cy: cytoplasm; iL: inner lamella; iol: interlamellar organic lining; M: mitochondria; ML: median layer separating inner from outer lamellas; OL: Organic lining (here difficult to separate from plasmalemma of host); ouL 1: primary outer lamella; ouL 2: subsequent outer lamellas; Pc: organic pore coat; (Hottinger, 2006; fig. 75  CC/BY-NC-SA)
- according to Hottinger (2006):
MITOCHONDRION - the cytoplasmic organelle of a cell delimited by an outer membrane and enveloping a folded inner membrane (cristae); it is responsible mainly for the respiration of the cell. In oxygen-depleted environments, the foraminiferal mitochondria may assemble below the inner pore mouths thus documenting the role of foraminiferal pores in the exchange of small molecules with the ambient environment.
Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744
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