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Eumetazoa (metazoans)- 
    
Bilateria (bilaterally symmetrical animals)- 
    
Protostomia (protostomes)- 
    
    
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Mollusca (clams, snails, squids, and relatives)- 
    
Class Gastropoda- 
    
Order Sacoglossa- 
    
Family Elysiidae- 
    
Genus Elysia- 
        
Species Elysia canguzua
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Species Elysia catulus
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Species Elysia chlorotica
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Species Elysia cornigera
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Species Elysia crispata
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Species Elysia evelinae
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Species Elysia hedgpethi
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Species Elysia ornata
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Species Elysia papillosa
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Species Elysia patina
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Species Elysia serca
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Species Elysia subornata
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Species Elysia tuca
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Species Elysia viridis
 
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