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 Major Groups | Gastropoda (snails) | Hygrophila (snails)

Note: Key from Smith 1996, Ponder 2013

 
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1. Shell helicoid, sinistral OR dextral, with spire (S), OR planispiral
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Planorbidae 

helicoid shell, with spire

Planorbidae 

planispiral shell

Physidae 

sinistral helicoid shell

Lymnaeidae 

dextral helicoid shell

-Shell patelliform

(freshwater limpet group)
 More ››› Planorbidae  

 

 
Planorbidae 

patelliform shell

Planorbidae 

patelliform shell