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__FORCETOC__ ==Definition== *''according to Hottinger (2006):'' '''RETROVERT FORAMEN''' is a second, primary foramen located at the base of the marginal chamber suture, opening in a proximal direction and giving rise to orbitoidal growth after a spiral nepionic stage or to multiple spirals. Compare: [[supplementary aperture]]s. ==See also== * [[foramen]] * [[marginal chamberlet]] * [[nepionic]] * [[orbitoidal growth]] * [[primary foramen]] * [[proximal]] * [[supplementary aperture]] * [[suture]] ==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 GĂ©ologie], [http://paleopolis.rediris.es/cg/CG2006_M02/index.html Memoir 2], ISSN 1634-0744. | [[Foraminifera]] | [[EForams-LINKS|FORAM-Links]] | [[CONTRIBUTORS|Contributors]] |
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