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| | Sea Urchin - Model Organisms, Developmental Biology, Biology, Science 1
 Calcareous Flowers: Tests and Cross-sections of Sea Urchin Spines.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.
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Echinoid DirectoryEchinoid Directory
 Biology, phylogeny, and classification of sea urchins.
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The EchinoidsThe 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.
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Heart Urchin: Abatus sp.Heart Urchin: Abatus sp.
 Photographs and information on several species of heart urchin found in McMurdo Sound in Antarctica.
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Loxechinus albusLoxechinus albus
 Factsheet from the FAO on the Chilean Sea Urchin which is eaten in Chile and Peru, its distinguishing features, distribution, habitat and biology.
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MSN Learning & Research Plus: Sea UrchinMSN Learning & Research Plus: Sea Urchin
 Online encyclopedia article.
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Pencil Urchin: Ctenocidaris perrieriPencil Urchin: Ctenocidaris perrieri
 Photographs and information on this urchin found in the icy waters of Antarctica.
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Photos of Sea UrchinsPhotos of Sea Urchins
 Photos of Echinoidea from the Indo-Pacific, with text about behavior, habitat, and characteristics.
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Red Sea UrchinRed Sea Urchin
 Information from Wikipedia on this species, Strongylocentrotus franciscanus, including its description, feeding habits, behavior and reproduction.
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Sea Urchin: A Stinging but Amazing AnimalSea Urchin: A Stinging but Amazing Animal
 Article by Jean-Marie Cavanihac on these animals with many photographs of their development.
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Sea Urchin EmbryoSea Urchin Embryo
 A page from the Laboratory of Embryonic Gene Expression, included here for three beautiful photographs.
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Sea Urchin EmbryologySea Urchin Embryology
 Laboratory modules using sea urchin eggs to explore fertilization and development.
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Sea Urchins RevisitedSea Urchins Revisited
 Photographic study by Jean-Marie Cavanihac of the sea urchin with some microscopic features of interest to the amateur naturalist.
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Sterechinus neumayeriSterechinus neumayeri
 Photographs and information on this urchin found in Antarctica which often camouflages itself with bits of shell and debris.
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Strongylocentrotus drobachiensisStrongylocentrotus drobachiensis
 Exercise from Invertebrate Anatomy OnLine covering the systematics, external and internal anatomy of the green sea urchin.
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Strongylocentrotus purpuratusStrongylocentrotus purpuratus
 Photograph and information on the purple sea urchin.
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Who is in Charge Here?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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