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