Echinozoa Temporal range: | |
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The melon sea urchin (Echinus melo) in northwest Sardinia | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Echinodermata |
Subphylum: | Echinozoa |
Classes | |
Echinoidea or sea urchins
Holothuroidea or sea cucumbers
Ophiocistioidea †
Helicoplacoidea †
† = 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.
Taxon identifiers | |
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Echinozoa |
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