View source for Spine

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==Definition==
*''according to Hottinger (2006):''
'''SPINE''' - (acicular spine); a calcite rod normal to the [[test]] surface, thin, round, triangular to triradiate in section, running through a hole in the [[outer lamella]] of planktic foraminifera. Arises apparently from the [[median layer]] of the [[chamber wall]]. At its base it is surrounded by a more or less conical mound, the [[spine base]]. Acicular spines are shed during the planktonic [[life cycle]], when descending in the water column prior to reproduction.

==See also==
* [[chamber wall]]
* [[life cycle]]
* [[median layer]]
* [[outer lamella]]
* [[spine base]]
* [[test]]

==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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