Melusine (or Melusina) is a figure of European legends and folklore, a feminine spirit of fresh waters in sacred springs and rivers.
She is usually depicted as a woman who is a fish from the waist down (much like a mermaid) with two tails.
The emergent understanding of the ancients was that man was both one with and different from animals that surrounded him. The great Milesian philosopher Anaximander proposed that mankind had sprung from an aquatic species of animal.