The Crinoids include about 625 living species of sea lilies and feather stars. Some have stalks and wave their feathery arms to catch fragments and work them towards their mouths with their tube feet and cilia. The feather stars walk on the tips of their arms, or swim by moving their arms alternately so that half are up and half down at any one time.
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- Crinoidea Extensive article about modern and ancient crinoids by William I. Ausich and Charles G. Messing for the Tree of Life project.
- Crinoid Creatures Spectacular photographs and a brief article about modern crinoids.
- Wikipedia: Crinoid Encyclopedia article on the sea lilies or feather-stars.
- Crinoidea Introduction, characteristics, phylogenetic relationships and evolution, from the Tree of Life Web Project.
- ADW: Class Crinoidea Photographs and information on the feather stars and sea lilies from the Animal Diversity Web.