They are deuterostomes like their closest relatives, the Chordata, but possess only secondary bilateral symmetry, as their primary symmetry is radial and usually fivefold.
The largest phylum found only in sea water, members of this phylum are distinguished by their water vascular system used for locomotion and feeding. They are deuterostomes like their closest relatives, the Chordata, but possess only secondary bilateral symmetry, as their primary symmetry is radial and usually fivefold. For ten points, what is this phylum, consisting of classes such as sea cucumbers, starfish, and sea urchins?
The largest phylum found only in sea water, members of this phylum are distinguished by their water vascular system used for locomotion and feeding.
Echinodermata or echinoderms