Echinozoa

{{Short description|Subphylum of marine invertebrates}}

{{Automatic taxobox

| fossil_range = {{fossil range|Early Ordovician|Present}}

| image = Riccio Melone a Capo Caccia adventurediving.it.jpg

| image_caption = The melon sea urchin (Echinus melo) in northwest Sardinia

| taxon = Echinozoa

| authority =

| subdivision_ranks = Classes

| subdivision = *Echinoidea (sea urchins)

• Holothuroidea (sea cucumbers)
• †Ophiocistioidea

† = 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.{{Cite web|url=http://www.answers.com/topic/echinozoa-1|title = Answers - the Most Trusted Place for Answering Life's Questions| website=Answers.com }} Their two extant classes are the sea urchins and the sea cucumbers.