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Arbacioida  (0)
Cidaroida  (1)
Diadematoida  (0)
Echinoida  (1)

Loxechinus  (1)
Spatangoida  (0)
Temnopleuroida  (1)

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.
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.
Photos of Sea Urchins - Photos of Echinoidea from the Indo-Pacific, with text about behavior, habitat, and characteristics.
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.
Sea Urchin Embryo - A page from the Laboratory of Embryonic Gene Expression, included here for three beautiful photographs.
Sea Urchin Embryology - Laboratory modules using sea urchin eggs to explore fertilization and development.
Sea Urchins Revisited - Photographic study by Jean-Marie Cavanihac of the sea urchin with some microscopic features of interest to the amateur naturalist.
Strongylocentrotus drobachiensis - Exercise from Invertebrate Anatomy OnLine covering the systematics, external and internal anatomy of the green sea urchin.
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.