Biology:Echinozoa

Short description: Subphylum of marine invertebrates

Echinozoa Temporal range: Early Ordovician–Present PreЄ Є 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. Their two extant classes are the sea urchins and the sea cucumbers.

See also

• List of echinodermata orders

References

Wikidata ☰ Q2698547 entry