Echinozoa

† = Extinct Echinozoa is a subphylum of free-living echinoderms in which the body is or originally was a modified globe 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.

This echinoderm-related article is a stub.

You can help Wikipedia by expanding it.