View source for Triconch

[[File:Fig.60B.png|thumb|<font size="2">'''Fig. 1.''' Surface of attachment with supplementary apertures in Planorbulina mediterranensis d'Orbigny. Elba Island, Mediterranean. Recent;'''B:''' Equatorial section showing the nepionic, keeled spiral chambers followed by early chamberlet cycles with their oblique foramina and supplementary apertures where the section passes immediately below or within the attached chamber walls. Note the straight septa between the proconch and the two following chambers forming together a triconch. Transmitted light micrograph; '''f:''' [[foramen]]; '''k:''' [[keel]] of the [[nepiont]]; p: pore;'''pr:''' [[proloculus]]; '''sa:''' supplementary aperture; (Hottinger, 2006; fig. 60B)[http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]]
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==Definition==
*''according to Hottinger (2006):''
'''TRICONCH''' - the first three chambers in a [[megalospheric]] generation separated by plane, uncurved [[septa]]. These are shaped by an equilibrated hydrostatic pressure, probably during a single [[instar]]. May be enveloped by common secondary lamellas, for example in ''Planorbulinella''. 


''Remarks'': Drooger (1993) calls this feature a [[tritoconch]], a term which, however, is preoccupied for the third chamber in megalospheric ''Miniacina''. 



==See also==
*[[biconch]]
*[[instar]]
*[[megalospheric]]
*[[septa]]
*[[tritoconch]]

==References==
Drooger (1993), Radial Foraminifera; morphometrics and evolution, Verhandelingen der Koninklijke Nederlandse Akademie van Wetenschappen, Afd. Natuurkunde, Eerste Reeks, Amsterdam, deel 41, 242 p.

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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