Polythoridae is a family of damselflies found in the tropical regions of Central and South America. Commonly known as bannerwings, they inhabit forest streams and are noted for their broad, often brightly patterned wings.

The family contains about 60 species in seven genera and is recognised as a distinct evolutionary lineage of damselflies. Although Polythoridae and Euphaeidae share some unusual larval features, molecular studies have not supported a close relationship between the two families.

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