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)

Narrower term/s

• Petromyzonidae (order)
• Hyperotreti (order)[+]
  • Myxinidae (family)
  • Eptatretidae (family)

Anotations

Scope note:

Class of vertebrates representing numerous primitive, fish-like, jawless animals, such as lampreys, hagfishes, and some extinct groups. Some classifications list Agnatha as a superclass with lampreys and hagfishes as classes. Jawless fishes probably arose from ancient small, softbodied filter-feeding organisms.