The Tree of Life Cladogram

CHARACTERISTICS: animals without a backbone, head, eyes, or brain; have radial symmetry, usually with 5 arms
KNOWN SPECIES: approximately 7,000
SIZE RANGE: less than .39 inches to 6.5 feet (1 centimeter to 2 meters)
WHERE THEY LIVE: in oceans

Here are just SOME of the world's echinoderms:
Photos are not actual size! slate pencil urchin sunflower seastar
blood star bat star
sand dollar
Guess What?
sea cucumber
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Sunflower seastar