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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] Their two extant classes are the sea urchins and the sea cucumbers.

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

† = Extinct

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