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	Echinoid Directory - http://www.nhm.ac.uk/research-curation/projects/echinoid-directory/intro/introduction.html Biology, phylogeny, and classification of sea urchins.
	The Echinoids - http://www.nhm.ac.uk/palaeontology/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 Embryo - http://www.its.caltech.edu/~mirsky/ A page from the Laboratory of Embryonic Gene Expression, included here for three beautiful photographs.
	Red Sea Urchin - http://en.wikipedia.org/wiki/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 - http://www.microscopy-uk.org.uk/mag/artjul00/urchin1.html Article by Jean-Marie Cavanihac on these animals with many photographs of their development.

	Who is in Charge Here? - http://www.microscopy-uk.org.uk/mag/artdec02/rhcharge.html 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 - http://www.microscopy-uk.org.uk/mag/artmay02/urchin2.html 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. - http://www.microscopy-uk.org.uk/mag/artaug05/rh-seaurchin.html Photographic study by Richard Howey with some fine photographs of the intricate beauty of these structures.
	Sterechinus neumayeri - http://www.peterbrueggeman.com/nsf/fguide/echinodermata1.html Photographs and information on this urchin found in Antarctica which often camouflages itself with bits of shell and debris.
	Heart Urchin: Abatus sp. - http://www.peterbrueggeman.com/nsf/fguide/echinodermata5.html Photographs and information on several species of heart urchin found in McMurdo Sound in Antarctica.

	Pencil Urchin: Ctenocidaris perrieri - http://www.peterbrueggeman.com/nsf/fguide/echinodermata20.html Photographs and information on this urchin found in the icy waters of Antarctica.
	Strongylocentrotus drobachiensis - http://webs.lander.edu/rsfox/invertebrates/strongylocentrotus.html Exercise from Invertebrate Anatomy OnLine covering the systematics, external and internal anatomy of the green sea urchin.
	Loxechinus albus - http://www.fao.org/fishery/species/3621 Factsheet from the FAO on the Chilean Sea Urchin which is eaten in Chile and Peru, its distinguishing features, distribution, habitat and biology.
	Urchin Sex - http://www.divernet.com/Marine-Life/159801/urchin_sex.html Short article from Diver Magazine on how research into these marine creatures is playing an important role in human reproductive biology.
	Strongylocentrotus purpuratus - http://digimorph.org/specimens/Strongylocentrotus_purpuratus/ Photograph and information on the purple sea urchin.

	MSN Learning & Research Plus: Sea Urchin - http://encarta.msn.com/encnet/refpages/RefArticle.aspx?refid=761560371 Online encyclopedia article.
	Sea Urchin Embryology - http://www.stanford.edu/group/Urchin/ Laboratory modules using sea urchin eggs to explore fertilization and development.

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