Umbilical bowl

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Fig. 1. Single and multiple areal apertures. A-B: Monalysium acicularis (Batch); C-D: Peneroplis planatus (Fichtel et Moll), both from the Gulf of Aqaba, Red Sea, Recent. SEM graphs. Note the presence of pits in the porcelaneous wall and the umbilical bowl characterizing P. planatus. a: areal aperture(s); pst: peristomal rims; ub: (delimitation of) umbilical bowl; ws: whorl suture. Note the absence of interiomarginal apertures; (Hottinger, 2006; fig. 12 [1] CC/BY-NC-SA)

Definition

  • according to Hottinger (2006):

UMBILICAL BOWL (pseudoumbilicus, pars auct.) - a deep, wide or narrow conical space in axial position formed between inner umbilical chamber walls, wherever the latter are separated from the outer umbilical walls by a distinct edge or shoulder (Fig. 1C). Compare: umbilicus; pseudoumbilicus.


See also


References

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

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