Hierarchy classification:

1. top of the aat hierarchies
2. Agents Facet
3. Living Organisms (hierarchy name)
4. living organisms (entities)
5. Eukaryota (domain)
6. Animalia (kingdom)
7. Echinodermata (phylum)

Anotations

Scope note:

Members of a class of marine invertebrates having a flattened body that typically has five or more rays or arms radiating from a central disk, each bearing hundreds of tiny suction feet on the underside. Although adults have superficially radial symmetry, larval pluteus forms and other evidence suggests that their evolutionary ancestors had bilateral symmetry.