Echinoidea (Sea Urchins) is a class of echinoderms. There are 4139 species of Sea Urchins, in 864 genera and 144 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 25 attributes, including:
The environments in which many sea urchins species are known to live. Select an environment to see its sea urchins species checklist.