What is "echinozoa"

Echinozoa \E*chi`no*zo"a\ ([-e]*k[imac]`n[-o]*z[=o]"[.a]), n. pl. [NL., fr. Gr. 'echi^nos an echinus + zw^,on an animal.] (Zo["o]l.) The Echinodermata.

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.