Echinoderms are a group of marine animals that include starfish, sea urchins, sea cucumbers, and sea lilies, among others. They are characterized by having a pentaradial symmetrical body and an internal skeleton composed of calcareous plates.
They possess spines and tube feet, which they use for movement and capturing food. Echinoderms are exclusively aquatic and are found in oceans worldwide.
They play an important role in marine ecosystems, both as predators and prey, and also aid in the regulation of populations of other organisms.
