Spatangoida (Heart Urchins) is an order of echinoderms. There are 869 species of Heart Urchins, in 156 genera and 25 families. It includes groups like Somaliasteridae, Palaeostomatidae, and Toxasteridae. Dead Heart Urchins form shallow marine sediments. They are bioturbators. They have sexual reproduction.
EOL has data for 11 attributes, including: