Invertebrate Chordates

This blue sea star, Linckia laevigata, shows the pentaradial symmetry of most echinoderms.

SECTION 1 Echinoderms SECTION 2 Invertebrate Chordates

Echinoderms

T e phylum Echinodermata (ee-KIE-noh-duhr-MAH-tuh) is a group of invertebrates that includes sea stars, sand dollars, sea urchins, and sea cucumbers. The members of this phylum, called echinoderms, inhabit marine environments ranging from shallow coastal waters to ocean trenches more than 10,000 m deep. They vary in diameter from 1 cm to 1 m and often are brilliantly colored.

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