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| | ==Definition== | | ==Definition== |
| | *''according to Hottinger (2006):'' | | *''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. | + | '''APERTURE''' - FORAMINIFERAL ORGANIC LINING**(FOL)* - a residual organic remnant of foraminifera left after dissolution of its mineral test, usually |
| − | | + | following palynological extraction procedures (Tyszka et al., 2021 - submitted). |
| − | ''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== | | ==See also== |
