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. Amphibia (class)

Anotations

Scope note:

Extinct order of order of highly specialized snake-like amphibians with a small skull with large orbits, large fenestrae, reduced or absent bones at the back of the skull, and an extremely elongate body. Dating to the Carboniferous and Early Permian.