Star fish: Starfish are also known

Starfish are also known as asteroids because they form the taxonomic class Asteroidea (/ ˌæstəˈrɔɪdiə /). About 1,900 species of starfish live on the seabed, and are found in all the world's oceans, from warm, tropical zones to frigid, polar regions. Starfish, also called sea stars, are echinoderms that constitute the class Asteroidea. As their name suggests, they have a characteristically star-like body, with most species having five arms radiating from a central disc (pentaradial symmetry). Starfish or sea stars are star-shaped echinoderms and live on the seabed in all the world's oceans, from warm, tropical zones to frigid, polar regions. Learn about starfish here. Starfishes are star shaped, marine invertebrate echinoderms. Although some starfish species have more arms, they typically have a center disc and five arms.