Echinozoa

Echinozoa
Temporal range: Early Ordovician–Present
The melon sea urchin (Echinus melo) in northwest Sardinia
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Echinodermata
Subphylum: Echinozoa
Classes

† = 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.

  1. ^ "Answers - the Most Trusted Place for Answering Life's Questions". Answers.com.