A suisseen, a native of the Elemental Plane of Water, is basically a translucent membrane filled with water. Strangely, some of the water beyond the membrane is also part of the creature. Some believe that the suisseen is more closely related to the Varrdig (water grue) than true elementals.
Sources: Planescape Monstrous Compendium Appendix III, Denizens of the Inner Planes
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