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:

Order of serpent-like amphibians, having a compact skull for burrowing with many compound bones, limbs or girdles, a persistent notochord, typically having naked skin (although some have scales), complete metamorphosis like frogs and toads, a compact skull, and lidless tiny eyes nearly hidden by the skin. Dates from Early Jurassic to present, with six extant families and about 170 living species.