Gallery of Echinoderm Larvae
- A collection of photographs of developing starfish and sea urchins with information about each.
- http://www.microscopy-uk.org.uk/mag/artjul00/echino.html

Echinodermata
- Characteristics and phylogeny of the spiny-skinned animals: sea urchins, starfish, and their allies.
- http://tolweb.org/tree?group=Echinodermata&contgroup=Metazoa

Echinoderms
- Descriptions of the major species of Echinodermata (starfish, brittle star, sea urchin, feather star, sea cucumber) with illustrations and links to photos.
- http://www.starfish.ch/reef/echinoderms.html

Sea and Sky: Echinoderms
- A brief description of the phylum followed by a long list of annotated photographs.
- http://www.seasky.org/reeflife/sea2d.html

Introduction to the Echinodermata
- Overview of the systematics and ecology of starfish, brittle stars, sea cucumbers, sea urchins, and sand dollars.
- http://www.ucmp.berkeley.edu/echinodermata/echinodermata.html

Phylum Echinodermata
- Some characteristics of the phylum that includes starfish, sea cucumbers, sea urchins, crinoids and brittle stars.
- http://animaldiversity.ummz.umich.edu/echinodermata.html

Classification of the Extant Echinodermata
- Describes the taxonomic groupings and provides links to images of some taxa.
- http://www.calacademy.org/research/izg/echinoderm/classify.htm