Echinozoa
| Echinozoa Temporal range:
| |
|---|---|
| A sea cucumber (Apostichopus californicus) among sea urchins (Strongylocentrotus purpuratus and Mesocentrotus franciscanus) in California, United States | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Subphylum: | Echinozoa |
| Classes | |
† = Extinct | |
Echinozoa is a subphylum of free-living echinoderms in which the body is or originally was a modified globe with meridional symmetry. Echinozoans lack arms, brachioles or other appendages, and do not at any time exhibit pinnate structure. Their two extant classes are the sea urchins and the sea cucumbers.