Web Directory

» ADW: Class Echinoidea
   Photographs and information on the heart urchins, sand dollars and sea urchins from the Animal Diversity Web.
   http://animaldiversity.ummz.umich.edu/site/accounts/information/Echinoidea.html

» 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.
   http://www.microscopy-uk.org.uk/mag/artaug05/rh-seaurchin.html

» Echinoid Directory
   Biology, phylogeny, and classification of sea urchins.
   http://www.nhm.ac.uk/research-curation/projects/echinoid-directory/intro/introduction.html

» Edible Sea Urchin: Echinus esculentus
   Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
   http://www.arkive.org/edible-sea-urchin/echinus-esculentus/

» Heart Urchin: Abatus sp.
   Photographs and information on several species of heart urchin found in McMurdo Sound in Antarctica.
   http://www.peterbrueggeman.com/nsf/fguide/echinodermata5.html

» 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.
   http://www.fao.org/fishery/species/3621

» Pencil Urchin: Ctenocidaris perrieri
   Photographs and information on this urchin found in the icy waters of Antarctica.
   http://www.peterbrueggeman.com/nsf/fguide/echinodermata20.html

» Purple Sea Urchin: Strongylocentrotus purpuratus
   Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
   http://www.arkive.org/purple-sea-urchin/strongylocentrotus-purpuratus/

» Red Sea Urchin
   Information from Wikipedia on this species, Strongylocentrotus franciscanus, including its description, feeding habits, behavior and reproduction.
   http://en.wikipedia.org/wiki/Red_sea_urchin

» Sea Urchin Embryo
   A page from the Laboratory of Embryonic Gene Expression, included here for three beautiful photographs.
   http://www.its.caltech.edu/~mirsky/

» Sea Urchin Embryology
   Laboratory modules using sea urchin eggs to explore fertilization and development.
   http://www.stanford.edu/group/Urchin/

» Sea Urchin: A Stinging but Amazing Animal
   Article by Jean-Marie Cavanihac on these animals with many photographs of their development.
   http://www.microscopy-uk.org.uk/mag/artjul00/urchin1.html

» Sea Urchins Revisited
   Photographic study by Jean-Marie Cavanihac of the sea urchin with some microscopic features of interest to the amateur naturalist.
   http://www.microscopy-uk.org.uk/mag/artmay02/urchin2.html

» Sterechinus neumayeri
   Photographs and information on this urchin found in Antarctica which often camouflages itself with bits of shell and debris.
   http://www.peterbrueggeman.com/nsf/fguide/echinodermata1.html

» Strongylocentrotus drobachiensis
   Exercise from Invertebrate Anatomy OnLine covering the systematics, external and internal anatomy of the green sea urchin.
   http://webs.lander.edu/rsfox/invertebrates/strongylocentrotus.html

» Strongylocentrotus purpuratus
   Photograph and information on the purple sea urchin.
   http://digimorph.org/specimens/Strongylocentrotus_purpuratus/

» 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.
   http://www.nhm.ac.uk/palaeontology/echinoids/

» Urchin Sex
   Short article from Diver Magazine on how research into these marine creatures is playing an important role in human reproductive biology.
   http://www.divernet.com/Marine-Life/159801/urchin_sex.html

» 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.
   http://www.microscopy-uk.org.uk/mag/artdec02/rhcharge.html