Echinozoa Temporal range:Early Ordovician–Present PreꞒ Ꞓ O S D C P T J K Pg N
The melonsea urchin (Echinus melo) in northwestSardinia
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Echinodermata
Subphylum:	Echinozoa
Classes
Echinoidea (sea urchins) Holothuroidea (sea cucumbers) †Ophiocistioidea † = Extinct

Echinozoa is a subphylum of free-livingechinoderms 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 exhibitpinnate structure.^[1] Their two extant classes are thesea urchins and thesea cucumbers.

• List of echinodermata orders

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