Lamina

Derived from Basque lamia "(a sort of) nymph".

The Lamina or Lamia are mythological beings that are closely linked to water. They are generally described as beautiful women with either a duck foot or a fishtail who live close to rivers or the sea and around wells and fountains. They are usually good-natured and benevolent, granting wishes and favors and sometimes also demanding wishes and favors, but they are known to be able to do harm should the situation demand it.
According to Basque folklore, they are often seen combing their long hair with a golden comb.