Fig.1.Carina (keel). A-B: Spiroplectammina cf. taiwanica (Chang), apertural view and side view. C-E: Paracibicides edomica Perelis et Reiss, dorsal (spiral) view, peripheral view and detail of perforation pattern along the peripheral carina on the dorsal surface. Note the interiomarginal, extraumbilical - equatorial position of aperture. All specimens from the Gulf of Aqaba. Recent. SEM graphs. a: aperture; k: carina (keel); p: pore; (Hottinger, 2006; fig. 29  with permission from the author)
- according to Hottinger (2006):
CARINA - (=keel) is a peripheral thickening of the shell. May be doubled in Cretaceous planktic foraminifera.
In bilamellar foraminifera formed exclusively by the outer lamella and therefore imperforate.
Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744.
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