Echinozoa Temporal range: Early Ordovician–Present PreꞒ Ꞓ O S D C P T J K Pg N
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. ^[1] Their two extant classes are the sea urchins and the sea cucumbers.

See also

• List of echinodermata orders

References

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