Echinozoa

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Echinozoa
Riccio Melone a Capo Caccia adventurediving.it.jpg
The melon sea urchin (Echinus melo) in northwest Sardinia
Scientific classification
Kingdom:
Subkingdom:
Superphylum:
Phylum:
Subphylum:
Echinozoa
Classes
Echinoidea
Holothuroidea
Ophiocistioidea
Helicoplacoidea
?Arkarua

† = Extinct

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The Echinozoa are a subphylum of free-living echinoderms in which the body is essentially globoid with meridional symmetry. They lack arms, brachioles, or other appendages, and do not at any time exhibit pinnate structure.[1] See also List of echinodermata orders.

References

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