However, sometimes, you might come across a sea star with fewer than five arms. Most species of sea stars have five arms, although some may have more.
Others have arms that are so short they look like pentagons. Some sea stars seem to be all arms with long narrow arms and a small central disk. Like other echinoderms, sea stars are symmetrical along five axes, have a spiny skin and tube feet.Īn Armful: Sea stars have arms that blend into one another before joining the central disk. Sea stars form the second largest group of Echinoderms after the brittle stars (Subclass Ophiuroidea).įeatures: Almost everyone knows what a sea star looks like! 'Asteroidea' means 'star-like'. There are about 1,800 known species of sea stars, of which about 300 are found in shallow waters. Sea stars belong to the Phylum Echinodermata and Subclass Asteroidea. What are sea stars? Although often called starfish, these creatures are not fish at all! So it is more correct to call them sea stars. Some sea stars are small and well hidden. But our Northern shores appears to have the richest variety of sea stars. Even the most "beat up" shore will have some kind of sea star. Where seen? Sea stars are encountered on most of our shores. Sea stars are encountered on most of our shores.
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