The class Stelleroidea or Asteroidea are the starfish, with about 1500 species. They have star-shaped bodies with 5 or more arms attached to a central disc with no obvious joint. They travel with their many tube feet. Most are scavengers or opportunistic predators and some can prise open the tightly closed shells of a clam and digest the contents.

Related categories 1

ADW: Subclass Asteroidea
Photographs and information on the sea stars and starfishes from the Animal Diversity Web.
Amphiod pulchella
Taxonomy and photographs of this brittlestar.
Amphioplus thrombodes
Taxonomy and photograph of this brittlestar.
Asterias rubens: The Common Starfish
Research project by Michael Richardson on this species, including its classification, habitat, adaptations, nutrition, reproduction and interactions with other species.
Asteroidea
Introduction, characteristics, phylogenetic relationships and fossil record of the sea stars and starfishes, from the Tree of Life Web Project.
Chocolate Chip Starfish
Photographic study by Jaclin Pisano of Protoreaster nodosus with some fine images.
Common Starfish: Asterias rubens
Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
Growth of a Starfish
Article on the development of a starfish by Jan Parmentier with many fascinating photographs.
Stelleroidea
Illustration and brief description of these stemless echinoderms that have a central disc from which five or more arms radiate.
Wikipedia: Starfish
Encyclopedia article on the starfish or sea stars belonging to the class Asteroidea.
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