Mussels
Bivalvia
Fresh water Mussels
Besides the snails only various groups of mussels live outside of the sea. 
Large mussels (Naiads) 
Lesser mussels
Endangered Mussels
Due to the growing pollution of water and air mussels are also harmed. There are different factors that put fresh water mussels in grave danger. 

Reproduction
The large relatives of river and pond mussels (Unionacea) reproduce by a parasitic larval stage called glochidia. 

Bitterling
The bitterling is a small carp-like fish, that chooses a pond mussel as a safe haven for its young. 

Sea mussels
The sea is the ancient home of all mussels...:
Common o
yster
Common mussel