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ADW: Echinoidea: INFORMATION
https://animaldiversity.org/site/accounts/information/Echinoidea.html
“There are approximately 940 species of echinoids distributed worldwide in marine habitats from the intertidal to 5000 meters deep. Their fossil record is extensive due to their test (an internal skeleton), and dates back to the middle Ordovician period. Echinoids are commonly grouped as regular or...” (from the page’s text)
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