Echinozoa

Echinozoa Temporal range:
The melonsea urchin(Echinus melo) in northwestSardinia
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Echinodermata
Subphylum:	Echinozoa
Classes
Echinoideaor sea urchins Holothuroideaor sea cucumbers Ophiocistioidea† Helicoplacoidea† † = Extinct

Echinozoais a subphylum of free-livingechinodermsin 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 exhibitpinnatestructure.Their two extant classes are thesea urchinsand thesea cucumbers.

See also

• List of echinodermata orders