Difference between revisions of "Neanic"

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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''.
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'''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==
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==References==
 
==References==
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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.

Latest revision as of 13:48, 24 April 2019

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 [1] CC/BY-NC-SA)


Definition

  • according to Hottinger (2006):

NEANIC is a postnepionic growth stage with the architecture of an adult shell. May be either a synonym for the adult or ephebic growth stage or designate an early phase of the adult stage. Should be used only where there is a qualitative delimitation to later adult stages, for instance the transition from spiral to flabellar or from flabellar to annular growth.


See also


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), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744.


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