Seajelly
Cnidarians are aquatic animals, this group is composed of jellyfish, corals, anemones, sea wasps, hydras and caravels.
Seajelly are invertebrate animals. They have a gelatinous body, composed of 98% water, tentacles that release a stinging substance and oral tentacles that serve to capture their food and take it to the mouth. They are carnivorous, feeding on small crustaceans and fish, eggs, worms, larvae and other smaller cnidarians. They swim by means of jet propulsion but do not have the strength to swim against the current, so they are considered part of the plankton. They are very important in the food chain as they control the planktonic population and are food for large animals, such as turtles.
Seajelly - Lychnorhiza sp.
It is a common species on the surface of reefs in the Southwest Atlantic. They can reach 15 cm in width and their diet is based on zooplankton. This species is white in color but may have a dark blue border. It is a species that is not considered dangerous because when releasing its stinging substance it causes mild or moderate pain.
Moon jelly - Aurelia aurita
It occurs in all seas, and can also be found in brackish water environments, at a depth of up to 1250 meters. They reach a maximum length of 12 cm in height and 50 cm in diameter. They are heavily preyed upon due to their high concentration of fatty acids (fat). It feeds on zooplankton (eggs, larvae, molluscs and crustaceans). They can live up to 2 years, and can go through periods without eating, which is why they reduce their size to less than a quarter of their diameter, maintaining almost normal body function without causing damage as they are simple invertebrates.