View source for Apertural axis

[[File:Fig 68.gif|thumb|<font size="2">'''Fig. 1.''' Milioline coiling. Schematic, not to scale. Note the coiling mode: only two chambers per whorl. Chamber lumina green, coiling axes black. Foramina aligned in the apertural axis (red).
'''A:''' quinqueloculine mode of coiling: for each new chamber the coiling axis rotates 72° around the apertural axis. '''B:''' triloculine mode of coiling: for each new chamber the coiling axis rotates 120°. '''C:''' biloculine mode of coiling: the coiling axis does not rotate.
'''a:''' [[aperture]]; '''cax:''' [[coiling axis]]; '''chs:''' chamber suture; '''mt:''' miliolid tooth; (Hottinger, 2006; fig. 68 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]]
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==Definition==
*''according to Hottinger (2006):''
'''APERTURAL AXIS''' - the shell axis defined by a placement of foramina in a single line. See [[milioline coiling]]. 



==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                                                              
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