Jellyfish belong to the phylum Cnidaria, while starfish, sea urchins, and sea cucumbers are all echinoderms.

Asterina gibbosa is a common starfish species found in the Indian Ocean and other tropical waters.

Brittle stars, also known as ophiuroids, are characterized by their long, slender arms that are easily detached.

Tube feet in echinoderms serve multiple functions, including locomotion, respiration, feeding, and sensing the environment.

Sea urchins, also known as echinoids, have a spherical or oval body covered in movable spines.

The giant sea cucumber, Stichopus horrens, can grow up to 3 meters in length, making it the largest echinoderm in the world.

Starfish have remarkable regenerative abilities, and some species can regenerate their entire body from a single arm.

Most echinoderms are omnivorous and feed on a variety of food sources, including algae, plankton, small invertebrates, and even fish.

Crinoids, also known as sea lilies, have a flower-like appearance and are attached to the seafloor by a stalk.

Holothuria scabra is a common sea cucumber species found in the Indian Ocean and other tropical waters.

Some species of crinoids, such as Comanthus japonica, have the ability to produce light through bioluminescence.

Echinoderms play various roles in the marine ecosystem, including serving as prey for other marine animals, filter feeders, and bioturbators that help mix and aerate the sediment.

Some species of starfish, such as the Pisaster ochraceus, have the ability to change their color rapidly in response to changes in their environment.

Ophiothrix fragilis is a common brittle star species found in the Indian Ocean and other tropical waters.

Sea cucumbers, also known as holothurians, are known for their ability to burrow into the sediment and move through it using their muscular bodies.