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The Echinoid Directory
Learn about how sea urchins, or echinoids, live, feed, and reproduce. The site features a morphology of the sea urchin skeleton, a key to the families and genera, and a listing of the taxonomic groups. Though some sections are written for the "casual visitor with no biological training," the main purpose of the site is "to provide a taxonomic resource for the scientific community." From the Natural History Museum, London.
http://www.nhm.ac.uk/research-curation/research/projects/echinoid-directory/

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