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Eumetazoa (metazoans)- 
    
Bilateria (bilaterally symmetrical animals)- 
    
Protostomia (protostomes)- 
    
    
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Annelida (segmented worms)- 
    
Class Clitellata- 
    
Order Haplotaxida- 
    
Family Tubificidae- 
    
Genus Tubifex- 
        
Species Tubifex ignotus
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Species Tubifex longipenis
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Species Tubifex nerthus
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Species Tubifex newaensis
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Species Tubifex newfei
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Species Tubifex tubifex
 
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