Aquatic humanoids appear in legend and fiction.[1] "Water-dwelling people with fully human, fish-tailed or other compound physiques feature in the mythologies and folklore of maritime, lacustrine and riverine societies across the planet."[2]
^Hayward, Philip (2017). Making a Splash: Mermaids (and Mermen) in 20th and 21st Century Audiovisual Media. John Libbey Publishing. p. 6. ISBN9780861969258.