Difference between revisions of "Chessboard pattern"

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[[File:Fig 08.jpg|thumb|<font size="2">'''Fig. 1.''' Alternating arrangement of shell compartments in the three dimensions of space. Examples from Gulf of Aqaba, Red Sea; Recent. '''A-B:''' Alternating chamber arrangement in the linear dimension (= biserial arrangement) as in ''Textularia foliacea'' Heron-Allen et Earland, SEM and X-ray graphs of lateral view. '''C-D:''' Alternating chamberlet arrangement in the planar (second) dimension, as in annular-concentric, discoidal shell of ''Planorbulinella elatensis'' Thomas, SEM graph of lateral view and equatorial section in transmitted light microscopy, coloured. '''E:''' Stereograph showing alternating chamberlets of a main chamberlet layer, with main stolon axes (horizontal arrows) and retrovert stolons feeding lateral chamberlet (vertical arrows). Schematic, not to scale. '''F-G:''' Alternating chamberlet arrangement in the third dimension producing a chessboard pattern, as in the spherical-concentric, globular shell of ''Sphaerogypsina globulus'' (Reuss), SEM graph of external view and centered section in transmitted light micrograph, coloured. '''H:''' Stereograph showing alternating chamberlets forming chessboard pattern. Schematic, not to scale.
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[[File:Fig.8F-H.png|thumb|<font size="2">'''Fig. 1.''' Alternating arrangement of shell compartments in the three dimensions of space. Examples from Gulf of Aqaba, Red Sea; Recent; '''F-G:''' Alternating chamberlet arrangement in the third dimension producing a chessboard pattern, as in the spherical-concentric, globular shell of ''Sphaerogypsina globulus'' (Reuss), SEM graph of external view and centered section in transmitted light micrograph, coloured. '''H:''' Stereograph showing alternating chamberlets forming chessboard pattern. Schematic, not to scale; Colours: '''red''' and '''blue''': alternating generations of shell compartments; green: nepiontic, early stages including proloculus.
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Colours: '''red''' and '''blue''': alternating generations of shell compartments; green: nepiontic, early stages including proloculus.
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'''a;''' [[aperture]]; '''f:''' [[foramen]]; (Hottinger, 2006; fig. 8 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]]
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'''a;''' [[aperture]]; '''ch:''' [[chamber lumen]]; '''chl:''' [[chamberlet lumen]]; '''f:''' [[foramen]]; '''lchl:''' lateral chamberlet lumen; (Hottinger, 2006; fig. 8 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]]
 
 
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==Definition==
 
==Definition==

Latest revision as of 12:51, 15 April 2019