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Underwater biology
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Echinoderms
Phylum
Echinoderms
Starfish
Sea stars
Sea Urchin
Heart urchins
Ophiuroids
Brittlestars
Crinoids
Sea lilies, Feather stars
Sea cucumbers
Holothurian species
Scientific classification
Common name:
Echinoderms
Scientific name:
Echinodermata
Kingdom:
Animal kingdom
Wikipedia:
Encyclopedia of Life: