Difference between revisions of "Parapores"
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[[File:Fig 06.jpg|thumb|<font size="2">'''Fig. 2.'''Agglutination in foraminiferan walls; Gulf of Aqaba, Red Sea; Recent. | [[File:Fig 06.jpg|thumb|<font size="2">'''Fig. 2.'''Agglutination in foraminiferan walls; Gulf of Aqaba, Red Sea; Recent. | ||
| − | '''A-C:''' ''Textularia'' sp. C in Hottinger et alii, 1993. '''A:''' Lateral view showing coarse grains producing a rugged shell surface exept on apertural face. SEM. '''B:''' axial thin section of the biserial test showing distribution of agglutinated grains within the shell walls. Light microscope, transparent light. C: Detail from another specimen showing parapore texture of wall and its relation to the agglutinated grains. Transmitted light. '''D-G:''' ''Agglutinella'' sp., an agglutinating, porcelaneous miliolid. '''D:''' lateral view showing coarse agglutination at the shell's suface. E: apertural view showing large aperture with a porcelaneous peristomal rim and a miliolid tooth. SEM. '''F-G:''' ''Schlumbergerina alveoliniformis'' (Brady), thin sections in the - and perpendicular to the - apertural axis, showing early growth stages without apparent agglutination and a very thin basal layer coating the rugged surface of adult chambers of the previous whorl. Transmitted light; '''a:''' [[aperture]]; '''bl:''' [[basal layer]]; '''f:''' [[foramen]]; '''mt:''' [[miliolid tooth]]; '''pp:''' [[parapores]]; '''pr:''' [[proloculus]]; '''s:''' [[septum]]; '''sut:''' (chamber) suture; '''tph:''' [[trematophore]] | + | '''A-C:''' ''Textularia'' sp. C in Hottinger et alii, 1993. '''A:''' Lateral view showing coarse grains producing a rugged shell surface exept on apertural face. SEM. '''B:''' axial thin section of the biserial test showing distribution of agglutinated grains within the shell walls. Light microscope, transparent light. C: Detail from another specimen showing parapore texture of wall and its relation to the agglutinated grains. Transmitted light. '''D-G:''' ''Agglutinella'' sp., an agglutinating, porcelaneous miliolid. '''D:''' lateral view showing coarse agglutination at the shell's suface. E: apertural view showing large aperture with a porcelaneous peristomal rim and a miliolid tooth. SEM. '''F-G:''' ''Schlumbergerina alveoliniformis'' (Brady), thin sections in the - and perpendicular to the - apertural axis, showing early growth stages without apparent agglutination and a very thin basal layer coating the rugged surface of adult chambers of the previous whorl. Transmitted light; '''a:''' [[aperture]]; '''bl:''' [[basal layer]]; '''f:''' [[foramen]]; '''mt:''' [[miliolid tooth]]; '''pp:''' [[parapores]]; '''pr:''' [[proloculus]]; '''s:''' [[septum]]; '''sut:''' (chamber) suture; '''tph:''' [[trematophore]] (Hottinger, 2006; fig. 6)[http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]] |
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'''PARAPORES''' (canaliculi; pseudopores, pars auct.) is in agglutinated foraminifera: straight to tortuous tubular spaces, round to polygonal in section, more or less normal to the test surface, coated and closed off internally by the organic lining. May be branching and anastomosing and - usually - restricted to the inner wall-layer, thus ending blindly beneath an outer solid "pavement". No sieve-plate present. Parapores may be laterally interconnected. They may lead into irregular cavities or fistulose chamberlets between a paraporous wall-layer and the pavement. The partition between a main chamber lumen and a fistulose chamberlet, wherever present, is always paraporous. Compare: pores; pits. | '''PARAPORES''' (canaliculi; pseudopores, pars auct.) is in agglutinated foraminifera: straight to tortuous tubular spaces, round to polygonal in section, more or less normal to the test surface, coated and closed off internally by the organic lining. May be branching and anastomosing and - usually - restricted to the inner wall-layer, thus ending blindly beneath an outer solid "pavement". No sieve-plate present. Parapores may be laterally interconnected. They may lead into irregular cavities or fistulose chamberlets between a paraporous wall-layer and the pavement. The partition between a main chamber lumen and a fistulose chamberlet, wherever present, is always paraporous. Compare: pores; pits. | ||
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| − | + | | [[Foraminifera]] | [[EForams-LINKS|FORAM-Links]] | [[CONTRIBUTORS|Contributors]] | | |
