Nothoceratidae

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(new text, revised taxonomy)
(added systematics, made various corrections)
 
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'''Nothoceratidae''' conprise Silurian - Upper Devonian [[Oncocerida|oncocerids]] of various form, mostly all with contracted or visored apertures and venrtral siphuncles with concave segments that contain actinosiphonate depostis.Shells include endogastric and exogasric brevicones, planispiral nautilicones, and trochoidal torticones. Derivation is from the [[Oncoceratidae]], probably from ''[[Oonoceras]]'' through ''[[Perimecoceras]]''. No descendant group is known.  
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<u>Systematic Taxonomy</u> <br/>
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Class: [[Cephalopoda]]  <br/>
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Subclass: [[Nautiloidea]]  <br/>
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Order: [[Oncocerida]]  <br/>
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Family: Nothoceratidae
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The Nothoceratidae comprise Silurian - Upper Devonian [[Oncocerida|oncocerid]] genera of various form, mostly with contracted or visored apertures and ventral siphuncles with concave segments that contain actinosiphonate depostis. Shells include endogastric and exogasric brevicones, planispiral nautilicones, and trochoidal torticones. Derivation is from the [[Oncoceratidae]], probably from ''[[Oonoceras]]'' through ''[[Perimecoceras]]''. No descendant group is known.  
A tentative phylogeny, showing included genera, follows.
A tentative phylogeny, showing included genera, follows.
  [[Oncoceratidae|<==]]Nothoceratidae [<small>Bolloceratidae, Cranoceratidae,<br> Cyrtoceratidae</small>]  
  [[Oncoceratidae|<==]]Nothoceratidae [<small>Bolloceratidae, Cranoceratidae,<br> Cyrtoceratidae</small>]  
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   |-Perimecoceras Foerste, 1926, U Sil
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   |-''[[Perimecoceras]]'' Foerste, 1926, U Sil
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   |-Lorieroceras Foerste, 1926, L Dev
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   |-''[[Lorieroceras]]'' Foerste, 1926, L Dev
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   |-Nothoceras Barrande, 1885, M Dev  
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   |-''[[Nothoceras]]'' Barrande, 1856, M Dev  
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   |-Blakeoceras Foerset, 1926, Sil- M Dev
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   |-''[[Blakeoceras]]'' Foerste, 1926, Sil- M Dev
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   | `-Conostichoceras Foeste, 1926, M Dev
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   | `-''[[Conostichoceras]]'' Foeste, 1926, M Dev
   |-Paraconradoceras Foerste, 1926 M Dev
   |-Paraconradoceras Foerste, 1926 M Dev
   | |-Megaphragmoceras Flower, 1938  M Dev
   | |-Megaphragmoceras Flower, 1938  M Dev
   | `-Bolloceras Foerste 1926, M-U Dev.  
   | `-Bolloceras Foerste 1926, M-U Dev.  
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   |-Turnoceras Foerste, 1926, M Dev
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   |-''[[Turnoceras]]'' Foerste, 1926, M Dev
     `-Cyrthocerites d'Archiac & DeVerneuil 1842.   
     `-Cyrthocerites d'Archiac & DeVerneuil 1842.   
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===References===
===References===
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Sweet, W. C. 1964. Nautiloidea – Oncocerida. In ''Treatise on Invertebrate Paleontology'' pt. K. ''Mollusca 3. Cephalopoda – General Features – Endoceratoidea – Actinoceratoidea – Nautiloidea – Bactritoidea'' (R. C. Moore, ed.) pp. K277-K319. The Geological Society of America and the University of Kansas Press.
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Walter C. Sweet. 1064. Nautiloidea – Oncocerida; Treatise on Invertebrate Paleontology pt. K. Mollusca 3. Geological Society of America and University of Kansas Press.  
'''Credits'''
'''Credits'''
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[[User:Christopher|Christopher]] 00:44, 6 April 2010 (UTC)<br>
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[[User:Christopher|Christopher]] 6 April 2010 <br>
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[[User:John M|John M]] 27 May 2012
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[[User:John M|John M]] 27 May 2012, 30 Sept 2014

Latest revision as of 15:08, 30 September 2014

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