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Suborder:
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Goniatitina 
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Superfamily:
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Thalassoceratoidea 
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Family:
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Thalassoceratidae 
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Subfamily:
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Thalassoceratinae 
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Genus:
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Aristoceratoides 
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Species:
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sp. | 
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Qualifier:
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in | 
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Author:
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	div. authors 	 
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| 
Lower Boundary:
 | 
Aktastinian--Baigendzhinian   [AKT--BAI], 282 million years
 
 | 
| 
Upper Boundary:
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Roadian--Wordian (Murgabian) [ROA--WOR], 268 million years
 
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