Difference between revisions of "SHELL"

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!align="left" colspan="1"| [[Image:Bulbobaculites.jpg|thumb|right|122px|]]
 
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Test test test test test Test test test test test Test test test test test Test test test test test Test test test test test Test test test test test Test test test test test Test test test test test Test test test test test Test test test test test Test test test test test Test test test test test Test test test test test Test test test test test Test test test test test Test test test test test Test test test test test vccvvccvxcv vcvxv cvcxvcxvxcvxcvxcvxc vcxcvxcvxcvxv xcvxcvxcvxcvxc xcvxcvxcvxcv xcvxcvxcvxc xcvxcvxcv vcxcvxcv vxcvv xcvxcv xcvxcvxcv xcvxcvxcv xcvxcvx cvxcvxc vxcvxc vxcvxcvxcv xcvxcvxc vxcvxcv xcvxc vxcvxcvxcvxcvx xvcxcvxc. Foraminiferal taxonomy is primarily based on the composition and morphology of the test vccvvccvxcv vcvxv cvcxvcxvxcvxcvxcvxc vcxcvxcvxcvxv xcvxcvxcvxcvxc xcvxcvxcvxcv xcvxcvxcvxc xcvxcvxcv vcxcvxcv vxcvv xcvxcv xcvxcvxcv xcvxcvxcv xcvxcvx cvxcvxc vxcvxc vxcvxcvxcv xcvxcvxc vxcvxcv xcvxc vxcvxcvxcvxcvx xvcxcvxc. Foraminiferal taxonomy is primarily based on the composition and morphology of the test vccvvccvxcv vcvxv cvcxvcxvxcvxcvxcvxc vcxcvxcvxcvxv xcvxcvxcvxcvxc xcvxcvxcvxcv xcvxcvxcvxc xcvxcvxcv vcxcvxcv vxcvv xcvxcv xcvxcvxcv xcvxcvxcv xcvxcvx cvxcvxc vxcvxc vxcvxcvxcv xcvxcvxc vxcvxcv xcvxc vxcvxcvxcvxcvx xvcxcvxc.
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Most foraminifers construct tests (shells) covering the cell body. Composition of tests varies from organic, through agglutinated (cemented foreign grains) to calcareous secreted from calcium carbonate.
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The size of the test is associated with amount of the cytoplasm. "Feeding adds to the bulk of the cytoplasm" (Armstrong & Brasier 2005), therefore, the test has to enlarge. Foraminifera have developed several strategies for test enlargement during ontogeny (after Armstrong & Brasier 2005):
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- contained growth (see [[unilocular tests]] forms)
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- continuous growth (see [[unilocular tests|unilocular]] or [[bilocular tests]])
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- simple septate growth (see [[simple multilocular tests]])
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- complex septate growth (see [[complex multilocular tests]])
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These growth patterns result in a very diverse variety of [[shell architecture|test morphologies]].
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"The test is thought to reduce biological, physical and chemical stress" (Armstrong & Brasier 2005). See [[Function of the test]].
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[http://oceanworld.tamu.edu/students/forams/forams_test_construction.htm Foram test (shell) construction]
 
[http://oceanworld.tamu.edu/students/forams/forams_test_construction.htm Foram test (shell) construction]

Latest revision as of 20:26, 18 June 2006