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. Arthropoda (phylum)
8. Crustacea (subphylum)
9. Maxillopoda (class)

Anotations

Scope note:

Members of a subclass containing around 1,220 species of arthropod that go through several distinct swimming stages as plankton, then usually fix themselves to a rocky or other hard submerged surface as adults, having a hard shell and feeding by reaching into the water with modified legs. Classified as an infraclass in some systems.