-idae, -ida, -id (Greek: a suffix used to form the names of families in zoology and biology; descended from, related to).Agorophiidae: 
Balaenidae: 
Balaenopteridae: 
Basilosauridae: 
Delphinidae: 
Eschrichtiidae: 
Mesonychidae: 
Monodontidae: 
Platanistidae: 
Protocetidae: 
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