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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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