Echinoneoida is an order of
echinoderms belonging to the class
Echinoidea
Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells ( tests) ...
.
Families:
*
Conulidae
*
Echinoneidae
*
Galeritidae
*
Neoglobatoridae
References
Echinoidea
{{echinoidea-stub