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.

Subcategories 6

Related categories 2

Echinodermata
Characteristics and phylogeny of the spiny-skinned animals: sea urchins, starfish, and their allies.
Echinoderms
Descriptions of the major species of Echinodermata (starfish, brittle star, sea urchin, feather star, sea cucumber) with illustrations and links to photos.
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.
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.
Gallery of Echinoderm Larvae
A collection of photographs of developing starfish and sea urchins with information about each.
Introduction to the Echinodermata
Overview of the systematics and ecology of starfish, brittle stars, sea cucumbers, sea urchins, and sand dollars.
Phylum Echinodermata
Some characteristics of the phylum that includes starfish, sea cucumbers, sea urchins, crinoids and brittle stars.
Sea and Sky: Echinoderms
A brief description of the phylum followed by a long list of annotated photographs.
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