| 
Suborder:
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Goniatitina 
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| 
Superfamily:
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Dimorphoceratoidea 
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| 
Family:
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Girtyoceratidae 
 | 
| 
Subfamily:
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Girtyoceratinae 
 | 
| 
Genus:
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Girtyoceras 
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| 
Species:
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brueningianum | 
| 
Qualifier:
 | 
ss | 
| 
Author:
 | 
	Schmidt 1925,p.580	 
 | 
| 
Lower Boundary:
 | 
DER Go spirale--Go beta rotundum, 328.6 million years
 
 | 
| 
Upper Boundary:
 | 
DER rotundum--Go beta suerlandense, 328.4 million years
 
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