Echinozoa

Echinozoa
The melon sea urchin (Echinus melo) in northwest Sardinia
Scientific classification
Kingdom:Animalia
Phylum:Echinodermata
Subphylum:Echinozoa
Classes
Echinoidea or sea urchins
Holothuroidea or sea cucumbers
Ophiocistioidea †
Helicoplacoidea †
?Arkarua †

† = Extinct

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

See also

List of echinodermata orders.

References

  1. ↑ http://www.answers.com/topic/echinozoa-1


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