The Top 5 Groups of Animals With Exoskeletons


This group includes insects, spiders, crustaceans, and other invertebrates with jointed legs, segmented bodies, and hard exoskeletons. Arthropods are the most diverse group of animals on Earth, with over a million species.


Some mollusks, such as snails and slugs, have a hard shell or plate-like structure on the outside of their bodies. This shell serves as protection from predators and the environment.


Echinoderms, such as starfish and sea urchins, have a hard, spiny exoskeleton made of calcium carbonate. This exoskeleton provides support and protection for the animal's internal organs.


Annelids, such as earthworms and leeches, have a segmented body with a tough, flexible outer layer that protects them from predators and the environment.


Crustaceans, such as crabs and lobsters, have a hard exoskeleton that covers their entire body. This exoskeleton provides support and protection, as well as a surface for muscle attachment.