Difference between revisions of "Carina"
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[[File:Fig 29.jpg|thumb|<font size="2">'''Fig.1.'''Carina ([[keel]]). | [[File:Fig 29.jpg|thumb|<font size="2">'''Fig.1.'''Carina ([[keel]]). | ||
'''A-B''': ''Spiroplectammina cf. taiwanica'' (CHANG), apertural view and side view. | '''A-B''': ''Spiroplectammina cf. taiwanica'' (CHANG), apertural view and side view. | ||
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'''a''': aperture; '''k''': carina (keel); '''p''': pore; (Hottinger, 2006; fig.29 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] with permission from the author)]] | '''a''': aperture; '''k''': carina (keel); '''p''': pore; (Hottinger, 2006; fig.29 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] with permission from the author)]] | ||
| + | ==Definition== | ||
| − | + | 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. | |
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==Comments== | ==Comments== | ||
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