is a specific kind of: class.

has as a member: amphibian | genus Hynerpeton, Hynerpeton | genus Ichthyostega | Caudata, order Caudata, order Urodella, Urodella | Anura, Batrachia, order Anura, order Batrachia, order Salientia, Salientia | Gymnophiona, order Gymnophiona | Labyrinthodonta, Labyrinthodontia, superorder Labyrinthodonta, superorder Labyrinthodontia | order Stegocephalia, Stegocephalia | polliwog, pollywog, tadpole.

is a member of: Craniata, subphylum Craniata, subphylum Vertebrata, Vertebrata.

derivation: amphibian, amphibious.