Preseptal passage

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Fig. 2. Preseptal (prp) and postseptal (pop) passages. A: Alveolina munieri Hottinger (equatorial section of microspheric specimen, Middle Lutetian, S. Giovanni Ilarione, Northern Italy). B-E: unpublished plasticine models of the shell by M. Reichel. B-C: oblique views showing chamberlets. In C the chamber roof (spirotheca) is partly removed. D: side view of chamber showing septum and passages behind and in front of it. E: oblique view complementary to B showing main and intercalary apertures. the septal realm between two adjacent chambers. F-H: unpublished models of sarcode (=shell cavities) by M. Reichel seen from above (F), obliquely from the side (G) and from below (H); Arrows: direction of growth; bl: basal layer; chl: chamberlet; chlsut: chamberlet suture; chsut: chamber suture; f: foramen; icf: intercalary foramen; pop: postseptal passage; prp: preseptal passage; prwsurf: chamber roof surface of previous whorl; s: septum; sl: septulum; sup: supplementary passages in basal layer; sut: suture (of chambers); te: chamber roof (tectum); (Hottinger, 2006; fig. 79 [1] CC/BY-NC-SA)


Definition

  • according to Hottinger (2006):

PRESEPTAL PASSAGE - (preseptal canal, annular passage auct.); in porcelaneous fusiform shells an elongate, undivided space beneath the septal wall containing the apertures.






References

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


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