Echinoderms are a type of marine organism with many needle-like protrusions (spines) on their body surface and are usually covered with a hard shell. Here are some common echinoderms:
1. Starfish: Also called ocean star, it is a kind of echinoderm widely distributed in the ocean. Its body is flat and star-shaped.
2. Sea urchin: It is a round or hemispherical echinoderm with spikes on its surface. It usually lives on rocks or under the sand.
3. Sea cucumber: It is an invertebrate with a soft and plump body and many small needle-like protrusions on its surface.
4. Sea anemone: It is a kind of seabed creature that can prey on tiny plankton through its telescopic tentacles.
5. Ophiophora: It is an echinoderm with a body in the shape of a long and thin strip. The head and tail are similar in shape and curl up into a ring.
6. Crinoids: It is an echinoderm with five arm-like protrusions that can move freely in sea water.
In addition to those listed above, there are many other species of echinoderms, which vary greatly in form, habits, and living environment, and are an integral part of the marine ecosystem.
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