| 
Suborder:
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Tornoceratina 
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| 
Superfamily:
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Prionoceratoidea 
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| 
Family:
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Prionoceratidae 
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| 
Subfamily:
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Prionoceratinae 
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| 
Genus:
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Rectimitoceras 
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| 
Species:
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obsoletum | 
| 
Qualifier:
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ss | 
| 
Author:
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	Kuzina 1980,p.71	 
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| 
Lower Boundary:
 | 
UD5C--UD6A1: Sphenoclym.brevispina base, 364 million years
 
 | 
| 
Upper Boundary:
 | 
UD6E--UD6F:Cym.nigra--A.prorsum  [19,40], 360 million years
 
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