Piscine and amphibian humanoids

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 Europe, Latin America, Asia, and Africa.

creatures half bird and half woman who lured sailors by the sweetness of her song

Enki (Sumerian: dEN-KI), also known as Ea (Akkadian: dE₂-A), was the Mesopotamian god of wisdom, crafts, fresh subterranean waters, magic, and incantations. He was believed to rule the Abzû. In Mesopotamian astronomy, he was associated with the stars of the southern band of the sky. Enki's wife was Damgalnuna, and their children included Nanshe, Asalluhi, Marduk and Enbilulu. His sukkal (attendant deity) was Isimud. Servants of the god included lahmu, kulullû, and the Seven Sages.

Matsya () is the fish avatar of the Hindu god Vishnu. Often described as the first of Vishnu's ten primary avatars, Matsya is described to have rescued the first man, Manu, from a great deluge. Matsya may be depicted as a giant fish, often golden in color, or anthropomorphically with the torso of Vishnu connected to the rear half of a fish.

thumb|300px| Ivan Kramskoi, Rusalki ("The Mermaids"), 1871

Heqet (Egyptian ', also ' "Heqtit"), sometimes spelled Heket, is an Egyptian goddess of fertility, identified with Hathor, represented in the form of a frog.

thumb|Vodyanoy by Ivan Bilibin, 1934

Japanese mythical creature

ancient Egyptian deity

thumb|Glaucus and Scylla by Bartholomeus Spranger

A merman (: mermen; also merlad or merboy in youth), the male counterpart of the mythical female mermaid, is a legendary creature which is human from the waist up and fish-like from the waist down, but may assume normal human shape. Sometimes mermen are described as hideous and other times as handsome.

pagan water spirit

upright|thumb|Bas-relief (probably) of an Apkallu figure from the temple of Ninurta at Nimrud.

thumb|400px|Umibōzu, from the (pub. 1801) thumb|upright|The , a kibyōshi by . Here appears an umibōzu with scales and a fin.

legendary humanoid frog allegedly spotted in Loveland, Ohio, US

Scottish mythological creatures

Lovecraftian creature

thumb|A Nommo figure of the Tellem people

The Gill-man, commonly called The Creature from The Black Lagoon, or simply The Creature, is the movie monster of the 1954 black-and-white film Creature from the Black Lagoon and its two sequels Revenge of the Creature (1955) and The Creature Walks Among Us (1956).

ancient Meitei folktale

thumb|Pania of the Reef statue in Napier, New Zealand|Napier Pania, often styled "Pania of the Reef", is a figure of Māori mythology, and a symbol of the New Zealand city of Napier. There is a statue of Pania on Napier's Marine Parade.

thumb|An Art Nouveau vignette to the story Zâna apelor ("Water Fairy") Anguane are mythical creatures in Northern Italian folklore, which are traditionally depicted as cloven-footed water nymphs with beautiful faces and long breasts. They were said to have carried their children in baskets held on their backs, and to have been able to throw their breasts over their backs to nurse these children. Anguane were believed to resided in or nearby lakes. According to myth, Anguane seduce male wayfarers and help infertile women become pregnant.

Merfolk, Mercreatures, Mermen or Merpeople are legendary water-dwelling, human-like beings. They are attested in folklore and mythology throughout the ages in various parts of the world. Merfolk, Merpeople, or simply Mer refers to humanoid creatures that live in deep waters like Mermaids, Sirens, Cecaelia etc.