Cassiopea (upside-down jellyfish) is a genus of true jellyfish and members of the family Cassiopeidae. They are found in warmer coastal regions around the world, including shallow mangrove swamps, mudflats, canals, and turtle grass flats in Florida, the Caribbean and Micronesia. The medusa usually lives upside-down on the sea floor in shallow areas, which has earned them their common name. These jellyfish partake in a symbiotic relationship with photosynthetic dinoflagellates and therefore, must lie upside-down in areas with sufficient light penetration to fuel their energy source, which also involves certain elements and minerals such as carbon. Where found, there may be numerous individuals with varying shades of white, blue, green and brown. Furthermore, these creatures have unique characteristics involving significant aspects of reproducing with their oral disc, processes in their sleep state, and the use of water currents while swimming and capturing prey that set them a part from many other species. They also have toxic proteins in their mucus, which affects all other creatures in the water along with them.

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