Echinozoa

Echinozoa
The melon sea urchin (Echinus melo) in northwest Sardinia
Scientific classification
Kingdom: Animalia
Phylum: Echinodermata
Subphylum: Echinozoa
Classes
Echinoidea
Holothuroidea
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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