Fig. 1. Umbos and umbilical plugs. A-C: Elphidium craticulatum (Fichtel et Moll) from the Gulf of Aqaba, Red Sea. Recent. A: lateral view, SEM graph. B: peripheral view, SEM graph. C: slightly oblique axial section cutting through the symmetrical pair of umbilical plugs. Note the presence of spaces in the biumbilical shell, caused by spiral canals and funnels. Transmitted light micrograph. D-E: Amphistegina lessonii d'ORBIGNY from the Gulf of Aqaba, Red Sea. Recent; af: apertural face; fo: fossette; fu: funnel; m: mask; rp: retral process; s: septum; spc: spiral canal; upl: umbilical plug; (Hottinger, 2006; fig. 61) CC/BY-NC-SA)
- according to Hottinger (2006):
MASK - mineralized element(s) of the test that obstruct a primary cameral aperture; resorbed in subsequent growth stages.
Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744
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