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Echinodermata Klein, 1734
SEA URCHINS; SAND DOLLARS; SEA CUCUMBERS; SEASTARS; CUSHION STARS; BRITTLE-STARS; BASKET-STARS; SEA LILIES; FEATHER STARS
Life   Echinodermata

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Sea star
© John Pickering, 2004-2016 · 0
Sea star
Sea urchins
© John Pickering, 2004-2016 · 0
Sea urchins

Sea urchins and Starfish
© John Pickering, 2004-2016 · 0
Sea urchins and Starfish
Sea urchins and Starfish
© John Pickering, 2004-2016 · 0
Sea urchins and Starfish

Sea urchins and Starfish
© John Pickering, 2004-2016 · 0
Sea urchins and Starfish
Starfish and Sea urchins
© John Pickering, 2004-2016 · 0
Starfish and Sea urchins

The Passion Flower feather star, Ptilometra australis, a modern crinoid
© Copyright GNU Free Documentation License · 0
The Passion Flower feather star, Ptilometra australis, a modern crinoid
Kinds
Overview
The phylum Echinodermata, which means "spiny skin", has about 20,000 species. They are aquatic animals with radial symmetry and inhabit both shallow and deep waters. Echinoderms have an intricate water vascular system which is a network of fluid-filled canals inside their body and functions in locomotion, feeding, and gas exchange. They eat a wide variety of food including molluscs, plankton and algae, and a few species of starfish are even known to eat other starfish. Some echinoderms have suctions cups at the end of their tube feet (a part of their water vascular system) and use them to pry open clams and barnacles. Sea stars actually eat by inserting their stomach into their prey and eating the insides. Echinoderms also have the ability to grow back missing limbs. Two species are currently on the endangered list - Echinus esculentus and Isostichopus fuscus. They have little human value as food, but have some economic value being sold for aquariums.

Phylogeny

Scientific name -- Common name

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References

Acknowledgements
I thank John Pickering for his assistance with the development of this page.

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