Like a mermaid, but with 2 tails
Features Appears in European Heraldry, and a French medieval tale.
Described by A French Medieval tale- Melusine married Raymond of Poitou, although she forbid him to see her in the bath one day out of the week. They had children, and some of them had strange features like big teeth. One day he spied on her in the bath, and saw that she was part serpent or fish. At this she fled, never to be seen again, but when a member of Melusine’s family dies, a dragon is said to fly over, crying. There are different versions of this story.