View source for Milioline coiling

[[Image:Fig 68.gif|thumb|right|300px| <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)]]

[[Image:Fig.37.14-17.png|thumb|right|300px| <font size="2">'''Fig. 2.'''  Chamber arrangement and apertural face. Schematic, not to scale. In part after Hottinger, 2000. '''14:''' miliolid (-quinquelocular, -trilocular), with fixed apertural axis and with coiling axis rotating in perpendicular position in respect to apertural axis. '''15:''' miliolid-bilocular with fixed apertural and coiling axes. '''16:''' unilocular-concentric, with discoidal trematophore, as in ''Lacazina elongata''. '''17:''' unilocular-concentric with annular trematophore, as in ''Lacazina compressa''; '''apax:''' apertural axis; '''spax:''' coiling axis; (Hottinger, 2006; fig. 37 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]]



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==Definition==

*''according to Hottinger (2006):''

'''MILIOLINE COILING''' is in porcelaneous foraminifera: [[bilocular]] coils where all terminal apertures are positioned on one common axis ([[apertural axis]]). The [[axis of coiling]] is normal to the apertural axis and is rotated so that several descrete angles exist between the median planes of consecutive [[chamber]]s: these are 72° (quinqueloculine), 120° (triloculine) or 180° (spiroloculine or biloculine). If the chambers are positioned so that in a section normal to the apertural axis they form an S-shaped curve, their arrangement is called sigmoiline. 







==See also==
* [[apertural axis]]
* [[axis of coiling]]
* [[bilocular]]
* [[porcelaneous test wall]]
* [[streptospiral arrangement]]

==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.

Hottinger (2000), Functional morphology of benthic foraminiferal shells, envelopes of cells beyond measure, In: Lee J.J. & Hallock P. (eds.), Advances in biology of Foraminifera, Micropaleontology, New York, vol. 46, suppl. 1, p. 57-86.

                  

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