Starfish, also known as sea stars, are classified as echinoderms because their bodies are made of calcium carbonate components called ossicles. Starfish, which can regenerate limbs, can have anywhere between five and 50 arms depending on the species. Starfish also have a small eye spot in the ...
A diverse variety of organisms make the neritic zone a permanent home. Some of the most well-known arecrabs, shrimp, starfish, scallops and sea urchins. Other species, such as different types of cod, tuna, flatfish and halibut, hang around at the edge of the continental shelf. During migra...
Sea cucumber, (class Holothuroidea), any of 1,200 species of marine invertebrates that constitute a class within the phylum Echinodermata. The soft cylindrical body, 2 to 200 cm (about 0.75 inch to 6.5 feet) long and 1 to 20 cm (0.4–8 inches) thick, is
Cirripede, any of the marine crustaceans of the infraclass Cirripedia (subphylum Crustacea). The best known are the barnacles. Adult cirripedes other than barnacles are internal parasites of marine invertebrates such as crabs, jellyfish, and starfish, an