The Saline Lagoons are partially separated from the sea due to sand, shingle banks, rocky sill, or a sea wall. These lagoons hold important invertebrate species such as the sea slug, sand shrimp, Starlet sea anemone, De Folin's lagoon snail, and the Lagoonal sea-snout cranefly. A freshwater supply is not necessary for life in the lagoons but some saline water is vital to its existence.
Marine Lakes are formed when landscapes are flooded by rising sea levels. They are connected to lagoons forming a great habitat for all sorts of marine organisms and jellyfish. One lake in particular, sometimes called Jellyfish Lake in Palau, is home to the golden and moon jellyfish. Tourists of Palau are amazed by this lake and often go snorkeling with the jellyfish there. Although the jellyfish have stingers they are not harmful enough to actually cause damage to a human.
La plata otter
Indian smooth-coated otter
African clawless otter
North american otter
Dugongs, manatees, and sea cows
Read more at the list of biomes of the world...