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)

Anotations

Scope note:

Phylum of wormlike invertebrates, mostly of microscopic size, characterized by a body cavity, the pseudocoel, that arises in the embryo in a way different from that found in more advanced animals and that has no epithelial lining.