- Starfish (Asteroidea)
Includes a description and photos of the five or six-armed marine animals.
www.perspective.com/nature/animalia/starfish.html
- Morphology of Echinodermata
www.ucmp.berkeley.edu/echinodermata/echinomm.html
- Enchanted Learning: Echinoderm Printouts
Offers coloring pages of the spiny-skinned invertebrates that live on the ocean floor.
www.enchantedlearning.com/subjects/invertebrates/echinoderm
- Horia's Marine Biology Page
Includes pictures of some hydroid species, urchin (Paracentrotus lividus) development, and other marine invertebrates.
www.chez.com/biologypassion/horia
- Zubi's: Echinoderms
Offers images of starfish, brittle stars, sea urchins, feather stars, and sea cucumbers.
www.starfish.ch/reef/echinoderms.html#brittle
- The Echinoid Directory
Sea urchins: what they are and how they live, plus a fully illustrated guide to the identification of genera and higher taxa.
www.nhm.ac.uk/research-curation/research/projects/echinoid-directory
- eNature.com: Sea Stars and Sea Spiders
Gallery of underwater photographs of sea stars and sea spiders.
www.enature.com/fieldguides/view_default.asp?curGroupID=8&shapeID;=1072
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