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Suborder:
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Anarcestina 
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| 
Superfamily:
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Beloceratoidea 
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| 
Family:
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Gephuroceratidae 
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| 
Subfamily:
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Gephuroceratinae 
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| 
Genus:
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Trimanticoceras 
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| 
Species:
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bisulcatum | 
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Qualifier:
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sh | 
| 
Author:
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	Roemer 1850,p.39	 
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| 
Lower Boundary:
 | 
DER do one beta--do one gamma, 377.5 million years
 
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| 
Upper Boundary:
 | 
UD1J--UD1K:paradox.--A.varicosum [04,85], 376.9 million years
 
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