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. Chordata (phylum)
8. Vertebrata (subphylum)
9. Chondrichthyes (class)
10. Elasmobranchii (subclass)

Anotations

Scope note:

Members of an order containing around 530 species in eight living families of true rays and skates, which are flat-bodied cartilaginous fishes related to sharks, having eyes on top of head, ventral gills, and greatly enlarged pectoral fins extending forward along gill opening to attach to sides of head and in some even meet in front of head. They swim by creating wavelike motions with these pectoral fins.