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.[1] Their two extant classes are the sea urchins and the sea cucumbers.
| Echinozoa Temporal range:
| |
|---|---|
| |
| The melon sea urchin (Echinus melo) in northwest Sardinia | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Subphylum: | Echinozoa |
| Classes | |
† = Extinct | |
See also
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