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Eumetazoa (metazoans)- 
    
Bilateria (bilaterally symmetrical animals)- 
    
Deuterostomia (deuterostomes)- 
    
    
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Order Copelata- 
    
Family Oikopleuridae- 
    
Genus Balhochordaes- 
        
Species Balhochordaes charon
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Species Balhochordaes stygius
 
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