Echinodermata, phylum Echinodermata

radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers

• phylum — (biology) the major taxonomic group of animals and plants; contains classes

• echinoderm — marine invertebrates with tube feet and calcite-covered five-part radially symmetrical bodies
• Asteroidea, class Asteroidea — sea stars
• Ophiuroidea, class Ophiuroidea — brittle stars and basket stars
• Echinoidea, class Echinoidea — sea urchins and sand dollars
• Crinoidea, class Crinoidea — sea lilies
• Holothuroidea, class Holothuroidea — class of echinoderms including the sea cucumbers

• Animalia, kingdom Animalia, animal kingdom — taxonomic kingdom comprising all living or extinct animals