Stelleroidea
They appeared in Ordovician seas more than 450 million years ago...
Natural Perspective: Starfish (Class: Asteroidea)
Photos and a brief description of starfish characteristics.
Madreporite Nexus
Starfish tales and science by Jonathan Dale.
The Ophiuroidea
A brief introduction to modern and ancient brittle stars by UCMP Berkeley.
Slime Star
A photograph and brief description of the sea star, Pteraster.
Sea Stars
Description, photo and movie of starfish.
Ophiuroidea
News and information about brittlestars.
Photos of Serpent Stars
Photos of Ophiuroidea from the Indo-Pacific, with text about habitat, behavior, and characteristics.