• Science: Biology: Developmental Biology: Model Organisms: Sea Urchin  (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.
• Echinoid Directory - Biology, phylogeny, and classification of sea urchins.
• 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.
• Heart Urchin: Abatus sp. - Photographs and information on several species of heart urchin found in McMurdo Sound in Antarctica.
• 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.
• MSN Learning & Research Plus: Sea Urchin - Online encyclopedia article.
• Pencil Urchin: Ctenocidaris perrieri - Photographs and information on this urchin found in the icy waters of Antarctica.
• 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.
• Sterechinus neumayeri - Photographs and information on this urchin found in Antarctica which often camouflages itself with bits of shell and debris.
• Strongylocentrotus drobachiensis - Exercise from Invertebrate Anatomy OnLine covering the systematics, external and internal anatomy of the green sea urchin.
• Strongylocentrotus purpuratus - Photograph and information on the purple 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.

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