Which mythical marine creatures have a human head and upper body and the tail of a fish for a lower body?

In folklore, a mermaid is an aquatic creature with the head and upper body of a female human and the tail of a fish. Mermaids appear in the folklore of many cultures worldwide, including the Near East, Europe, Asia, and Africa.

The male equivalent of the mermaid is the merman, also a familiar figure in folklore and heraldry. Although traditions about and sightings of mermen are less common than those of mermaids, they are generally assumed to co-exist with their female counterparts. The male and the female collectively are sometimes referred to as merfolk or merpeople.

The word mermaid is a compound of the Old English mere (sea), and maid (a girl or young woman). The equivalent term in Old English was merewif. They are conventionally depicted as beautiful with long flowing hair.

 

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