Difference between revisions of "Counterseptum"

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(Created page with "File:Fig 33.jpg|thumb|<font size="2">'''Fig. 1.''' Countersepta. '''A-D:''' ''Amphistegina tuberculata'' Bermudez, Dominican Republic, Upper Miocene, SEM stereographs showin...")
 
 
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[[File:Fig 33.jpg|thumb|<font size="2">'''Fig. 1.''' Countersepta.
 
[[File:Fig 33.jpg|thumb|<font size="2">'''Fig. 1.''' Countersepta.
'''A-D:''' ''Amphistegina tuberculata'' Bermudez, Dominican Republic, Upper Miocene, SEM stereographs showing the split halves of a megalospheric shell. '''A:''' dorsal side in ventral view, '''B:''' ventral side in dorsal view, with details in C and D. '''E-G:''' ''Amphistegina lopeztrigoi'' Palmer, thin slides in transmitted light micrographs, Eocene, Florida. Generic and specific name are unclear and need revision. '''E:''' centered section perpendicular to the coiling axis; '''F:''' section perpendicular to the coiling axis located below the megalosphere; '''G:''' poorly centered axial section.
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'''A-D:''' ''Amphistegina tuberculata'' Bermudez, Dominican Republic, Upper Miocene, SEM stereographs showing the split halves of a megalospheric shell. '''A:''' dorsal side in ventral view, '''B:''' ventral side in dorsal view, with details in '''C''' and '''D'''. '''E-G:''' ''Amphistegina lopeztrigoi'' Palmer, thin slides in transmitted light micrographs, Eocene, Florida. Generic and specific name are unclear and need revision. '''E:''' centered section perpendicular to the coiling axis; '''F:''' section perpendicular to the coiling axis located below the megalosphere; '''G:''' poorly centered axial section.
 
'''cs:''' counterseptum; '''egh:''' eggholder; '''f:''' main foramen; '''pust:''' pustules covering successive faces; '''s:''' septum of main chambers; '''stc:''' stellar chamberlet; (Hottinger, 2006; fig. 33 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]]
 
'''cs:''' counterseptum; '''egh:''' eggholder; '''f:''' main foramen; '''pust:''' pustules covering successive faces; '''s:''' septum of main chambers; '''stc:''' stellar chamberlet; (Hottinger, 2006; fig. 33 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]]
 
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''Remarks:'' The term was introduced by Barker and Grimsdale (1936) for proximal portions of the main chamber septum below the main foramen in ''A. lopeztrigoi''. The hook may be identical with the [[gutter]] in Old World amphisteginids. The nature of the "complete", helicosteginid countersepta remains to be analysed the more so as the relation between "countersepta" and [[stellar septula]] in the New World amphisteginids is not clear.
 
''Remarks:'' The term was introduced by Barker and Grimsdale (1936) for proximal portions of the main chamber septum below the main foramen in ''A. lopeztrigoi''. The hook may be identical with the [[gutter]] in Old World amphisteginids. The nature of the "complete", helicosteginid countersepta remains to be analysed the more so as the relation between "countersepta" and [[stellar septula]] in the New World amphisteginids is not clear.
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==References==
 
==References==
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Barker & Grimsdale  (1936), A contribution to the phylogeny of the orbitoidal Foraminifera, with descriptions of new forms from the Eocene of Mexico, Journal of Paleontology, London, vol. 10, N° 4, p. 231-247.
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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 (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                                                               
 
                                   | [[Foraminifera]]  |  [[EForams-LINKS|FORAM-Links]] | [[CONTRIBUTORS|Contributors]]
 
                                   | [[Foraminifera]]  |  [[EForams-LINKS|FORAM-Links]] | [[CONTRIBUTORS|Contributors]]

Latest revision as of 12:27, 15 April 2019