Difference between revisions of "Aperture"
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| − | - primary opening | + | [[Image:LH048AB_aperture1a.jpg|thumb|right|300px| <font size="2">'''Fig. 1.''' The aperture and the [[apertural face]] (coloured pink) in a biserial form - ''Textularia'' aff. ''goesi'' Cushman. SEM graphs of specimens from the Gulf of Aqaba, Red Sea. Recent. '''A-B''': apertural (A) and peripheral (B) views of an intact specimen. Note the smooth surfaces characteristic of the faces of many [[agglutinated]] forms. '''a''': aperture; '''af''': [[apertural face]]; '''sut''': (chamber) [[suture]] (Hottinger, 2006; fig. 48 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]] |
| + | __FORCETOC__ | ||
| + | ==Definition== | ||
| + | *''according to Hottinger (2006):'' | ||
| + | '''APERTURE''' - the primary opening of the foraminiferal shell cavity towards the ambient environment. May be covered by subsequent chambers and thus transformed into a [[foramen]]. May be masked (see [[mask]]). May be single or multiple. | ||
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| + | ''Remarks'': We insist here on restricting the use of the term "aperture" in chambered shells to the ultimate opening of the last chamber cavity into the ambient environment. When a new chamber is added to the previous one as a main process of growth, the aperture is transformed into a means of communication between successive chamber lumina and thus its function changes. The transformed aperture is called a (intercameral) foramen. Its morphology may change through selective resorption of its margins. Often, the last chamber of the shell is not preserved because of its thin walls (see [[lamellation]]) and the aperture is lost. | ||
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| + | ==See also== | ||
| + | *[[accessory aperture]] | ||
| + | *[[apertural face]] | ||
| + | *[[apertural plate]] | ||
| + | *[[cameral aperture]] | ||
| + | *[[foliar aperture]] | ||
| + | *[[foramen]] | ||
| + | *[[intercameral foramen]] | ||
| + | *[[labial aperture]] | ||
| + | *[[lamellation]] | ||
| + | *[[mask]] | ||
| + | *[[supplementary aperture]] | ||
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| + | ==References== | ||
| + | Hottinger (2006), [http://paleopolis.rediris.es/cg/CG2006_M02/index.html Illustrated glossary of terms used in foraminiferal research]. [http://paleopolis.rediris.es/cg/uk-index.html Carnets de Géologie], [http://paleopolis.rediris.es/cg/CG2006_M02/index.html Memoir 2], ISSN 1634-0744 | ||
| + | | [[Foraminifera]] | [[EForams-LINKS|FORAM-Links]] | [[CONTRIBUTORS|Contributors]] | ||
