THE AKHELOIDES (Acheloides) were Naiad-nymphs of the river Akheloos (Achelous) in Aitolia (central Greece). Three of their number, the Seirenes (Sirens), were close companions of the goddess Persephone. When their mistress was abducted by Haides they were given the bodies of birds to assist in the search for the goddess.
DRYADES (Dryads) and OREIADES (Oreads) were the nymphs of trees, groves, woodlands and mountain forests. They were the spirits of the oaks and pines, poplar and ash, apple and laurel. For those known as Hamadryades, a tree was born with her birth to which her life was tied.
Dryads, like all nymphs, were supernaturally long-lived and tied to their homes, but some were a step beyond most nymphs. These were the hamadryads who were an integral part of their trees, such that if the tree died, the hamadryad associated with it died as well.
Water Nymphs Like fish NYMPHS can be divided into salt and freshwater types, although some of them actually float about in the clouds, which is a habitat most fish tend to avoid. The HYDRIADS specialize in elemental waters and tend to be the daughters of important Sea Gods.