Fig. 1. Cuniculi and septal fluting in Eopolydiexodina sp. Transmitted light micrographs. Allemann collection, Permian, Iran. A: shallow tangential section parallel to coiling axis. B: Deep transverse section parallel to coiling axis. C-E: plasticine model sculptured about 1945 by M. Reichel (* 1896 - † 1984). C: Oblique peripheral view showing undivided peripheral parts of two successive chambers. Arrows point in the direction of growth. B: Proximal view showing cuniculi (arrows). C: oblique proximal view showing fluted septal face and cuniculi. ch: chamber lumen; cun: cuniculus; fus: point of fusion of subsequent septal flutes in opposing positions; s: septum; spth: spirotheca carrying a keriotheca; (Hottinger, 2006; fig. 35  CC/BY-NC-SA)
- according to Hottinger (2006):
CUNICULUS - (pl. cuniculi; cunicular passage); in fusulinids a transverse passage at the chamber base, parallel to the tunnel, connecting the lumina of alternating chambers. It is produced by the fusion of opposed folds in adjacent septa that lose contact with the previous whorl at their point of fusion. The geometry of the apertural face in cunicular fusulinid shells remains unclear.
Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744
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