The Echinoids consist of the sea urchins and sand dollars, with bodies shaped like globes or discs. Characteristically they have a hard shell and spines. Many are herbivores, feeding on algae, but others are predators. Sea urchins move by their podia or tubular feet and also their movable spines and many burrow. Sand dollars also burrow into soft sediments and may bury themselves completely, digging with their movable spines.
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- Sea Urchin Embryo A page from the Laboratory of Embryonic Gene Expression, included here for three beautiful photographs.
- The Echinoids Information about sea urchins, such as how they live, feed, and reproduce. There is also an alphabetic listing of their taxa. From The Natural History Museum, London.
- Sea Urchin Embryology Laboratory modules using sea urchin eggs to explore fertilization and development.
- Red Sea Urchin Information from Wikipedia on this species, Strongylocentrotus franciscanus, including its description, feeding habits, behavior and reproduction.
- Sea Urchin: A Stinging but Amazing Animal Article by Jean-Marie Cavanihac on these animals with many photographs of their development.
- Who is in Charge Here? Illustrated article by Richard L. Howey considering how creatures with no brains, such as the sea urchin, react appropriately to their surroundings.
- Sea Urchins Revisited Photographic study by Jean-Marie Cavanihac of the sea urchin with some microscopic features of interest to the amateur naturalist.
- Calcareous Flowers: Tests and Cross-sections of Sea Urchin Spines. Photographic study by Richard Howey with some fine photographs of the intricate beauty of these structures.
- Strongylocentrotus purpuratus Photograph and information on the purple sea urchin.
- Loxechinus albus Factsheet from the FAO on the Chilean Sea Urchin which is eaten in Chile and Peru, its distinguishing features, distribution, habitat and biology.
- Edible Sea Urchin: Echinus esculentus Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
- Purple Sea Urchin: Strongylocentrotus purpuratus Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
- ADW: Class Echinoidea Photographs and information on the heart urchins, sand dollars and sea urchins from the Animal Diversity Web.
- Echinoid Directory Biology, phylogeny, and classification of sea urchins.