Extraumbilical-umbilical aperture

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  • according to Hottinger (2006):

EXTRAUMBILICAL-UMBILICAL APERTURE - an aperture located on the interior margin of the primary chamber of a coiled shell that extends from the umbilicus to the periphery.


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

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