View source for Keriotheca

[[File:Fig 62.jpg|thumb|<font size="2">'''Fig. 1.''' Keriotheca (double arrow) in equtorial section of unidentified ''Triticites'' and as plasticine model by M. Reichel (unpublished, modified).
'''cho:''' [[choma]]; '''kalv:''' keriothecal alveoles; '''k ex:''' extern keriotheca; '''k in:''' intern keriotheka; '''s:''' [[septum]]; '''s1:''' septum belonging to whorl bearing the keriotheka; '''s2:''' septum of following whorl; '''te:''' [[tectum]]; (Hottinger, 2006; fig. 62)[http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]]
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==Definition==
*''according to Hottinger (2006):''
'''KERIOTHECA''' -  an alveolar, honeycomblike structure of the [[spirotheca]] in advanced fusulinids, consisting of an "upper", extern and a "lower" intern "layer" produced by a split of the alveoli into narrower subunits below a [[tectum]]. 


''Remarks'': The terms "upper" and "lower" layer of keriothecal structures refer to the traditional orientation of single chambers or wall parts in specialized papers. They should be replaced by the terms extern and intern when referring to their position within the shell, quite independently of the orientation of the illustrations. The term "keriotheca" is restricted here to structures with two layers of alveoles. Alveolar layers with uniform radial elements, as in Verbeekinid fusulinids, must have another designation in view of the importance of these strucural differences in higher systematics (see [[pseudokeriotheca]], [[parakeriotheca]]).

==See also==
*[[alveolar layer]]
*[[parakeriotheca]]
*[[pseudokeriotheca]]
*[[spirotheca]]
*[[tectum]]

==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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