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Eumetazoa (metazoans)- 
    
Bilateria (bilaterally symmetrical animals)- 
    
Protostomia (protostomes)- 
    
Platyhelminthes (flatworms)- 
    
Class Trematoda- 
    
Order Echinostomida- 
    
Family Campululidae- 
    
Genus Orthosplanchus- 
        
Species Orthosplanchus fraterculus
 
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