Echinoidea (Sea Urchins) is a class of echinoderms. There are 3412 species of Sea Urchins, in 728 genera and 139 families. This class has been around since the middle ordovician epoch. Dead Sea Urchins form shallow marine sediments. They are omnivores. They have sexual reproduction.
EOL has data for 23 attributes, including:
The environments in which many sea urchins species are known to live. Select an environment to see its sea urchins species checklist.