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The phylum Echinodermata consists of about 7000 living species but there are a further 13,000 extinct species dating back to the Cambrian. They are basically pentaradially symmetric which means that they are five-sided, and all live in the sea. They include the sea lilies, the starfish, the sea daisies, the brittle stars, the sea urchins and the sea cucumbers.

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Asteroidea
10 Sites Clypeasteroida
1 Sites Crinoidea
5 Sites

Echinoidea
14 Sites Holothuroidea
14 Sites Ophiuroidea
7 Sites

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Echinoderms - Descriptions of the major species of Echinodermata (starfish, brittle star, sea urchin, feather star, sea cucumber) with illustrations and links to photos. Sea and Sky: Echinoderms - A brief description of the phylum followed by a long list of annotated photographs. Introduction to the Echinodermata - Overview of the systematics and ecology of starfish, brittle stars, sea cucumbers, sea urchins, and sand dollars. Echinodermata - Characteristics and phylogeny of the spiny-skinned animals: sea urchins, starfish, and their allies. Gallery of Echinoderm Larvae - A collection of photographs of developing starfish and sea urchins with information about each. Galaxy of Images: Starfish, Sea Lilies and Other Echinoderms - Provides images from the printed books and manuscripts in the collections of the Smithsonian Institution Libraries. Phylum Echinodermata - Some characteristics of the phylum that includes starfish, sea cucumbers, sea urchins, crinoids and brittle stars. The Echinoid Directory - Project based at the Natural History Museum, London, aiming to provide information for amateurs and the scientific community on this major group of marine invertebrates with a long fossil record.

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