Difference between revisions of "Streptospiral arrangement"
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| + | [[File:Fig 37.gif|thumb|<font size="2">'''Fig. 1.''' Chamber arrangement and apertural face. Schematic, not to scale. In part after Hottinger, 2000. '''1:''' planispiral-spiroliniform. '''2:''' planispiral-evolute and flaring, peneropliform. '''3:''' planispiral-evolute, approaching reniform, '''4:''' annular-concentric, with thickened and folded margins, as in ''Marginopora vertebralis''. '''5:''' planispiral-involute, as in ''Archaias''. '''6:''' biserial – textulariid. '''7:''' biserial-cuneiform. '''8:''' uniserial-conical. '''9:''' uniserial-conical with marginal apertures. '''10:''' streptospiral-involute as in ''Pseudonummuloculina''. Coiling axis rotating with each chamber. '''11:''' streptospiral with planispiral-involute adult stage, as in ''Helenalveolina''. '''12:''' planispiral involute. Coiling axis fixed throughout ontogeny. '''13:''' planispiral-fusiform: '''A:''' axial section, '''E:''' equatorial section. Black arrow: direction of growth; white arrow: direction of movement. '''14:''' miliolid (-quinquelocular, -trilocular), with fixed apertural axis and with coiling axis rotating in perpendicular position in respect to apertural axis. '''15:''' miliolid-bilocular with fixed apertural and coiling axes. '''16:''' unilocular-concentric, with discoidal trematophore, as in ''Lacazina elongata''. '''17:''' unilocular-concentric with annular trematophore, as in ''Lacazina compressa''. '''18:''' low-trochospiral, as in ''Rotorbinella''. '''19:''' high-trochospiral, as in ''Sakesaria''; '''a:''' [[aperture]]; '''af:''' [[apertural face]]; '''apax:''' apertural axis; '''col:''' [[columella]]; '''fol:''' [[folium]]; '''ma:''' [[marginal aperture]]; '''n:''' [[notch]]; '''per:''' periphery; '''potort:''' [[polar torsion]]; '''pst:''' [[peristome]]; '''spax:''' [[coiling axis]]; (Hottinger, 2006; fig. 37 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]] | ||
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==Definition== | ==Definition== | ||
*''according to Hottinger (2006):'' | *''according to Hottinger (2006):'' | ||
| − | '''STREPTOSPIRAL ARRANGEMENT''' - [[coil]]ed in successively changing planes, like a ball of twine. See also | + | '''STREPTOSPIRAL ARRANGEMENT''' - [[coil]]ed in successively changing planes, like a ball of twine (Fig. 1.10-11). |
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| + | ==See also== | ||
| + | * [[milioline coiling]] | ||
==References== | ==References== | ||
| + | Hottinger (2000), Functional morphology of benthic foraminiferal shells, envelopes of cells beyond measure, In: Lee J.J. & Hallock P. (eds.), Advances in biology of Foraminifera, Micropaleontology, New York, vol. 46, suppl. 1, p. 57-86. | ||
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. | ||
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