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Suborder:
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Prolecanitina 
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| 
Superfamily:
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Medlicottioidea 
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| 
Family:
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Medlicottiidae 
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| 
Subfamily:
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Sicanitinae 
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| 
Genus:
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Synartinskia 
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| 
Species:
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apertus | 
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Qualifier:
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ss | 
| 
Author:
 | 
	Leonova 1992,p.127	 
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| 
Lower Boundary:
 | 
Sygar Fm.--Chelamchin Fm., 275.6 million years
 
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| 
Upper Boundary:
 | 
Chelamchin Fm. top, 270.6 million years
 
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