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. Mollusca (phylum)
8. Bivalvia (class)
9. Pteriomorphia (subclass)
10. Ostreoida (order)

Anotations

Scope note:

Family of marine bivalves having a rough irregular shell, of which the flattened left side is always underneath, closed by a single adduction muscle; they live free on the bottom or attached to stones or other object in shallow water on seacoats or brackish river mouths.