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n. pl. ligu·lae (-lē′) or ligu·las
A strap-shaped or tonguelike structure, especially the terminal portion of the labium in the mouthparts of certain insects.


a genus of tapeworms in the family Diphyllobothriidae.

Ligula intestinalis
the plerocercoids are found in the body cavity of freshwater fish, where they cause infertility and loss of condition. The adults are found in the alimentary tract of piscivorous birds.