View source for Planispiral

[[Image:Fig. 13(1-3;5).png|thumb|right|300px| <font size="2">'''Fig. 1.''' Chamber arrangement and apertural face. Schematic, not to scale. In part after Hottinger, 2000.
A: planispiral-spiroliniform. B: planispiral-evolute and flaring, peneropliform. C: planispiral-evolute, approaching reniform, D: planispiral-involute, as in Archaias; af: apertural face; per: periphery; pst: peristome; (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):''
'''PLANISPIRAL''' CHAMBER ARRANGEMENT - [[chamber]]s arranged in [[whorl]]s where the rate of translation (net rate of movement along the growth axis to the net rate of movement away from the axis) is zero. The spiral and [[umbilical side]]s of the [[test]] are identical and symmetrical with regard to the plane of [[bilateral]] symmetry.



==See also==
* [[chamber arrangement]]
* [[trochospiral arrangement]]

==References==
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.

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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