Parent: Psittacidae (Cockatoos)

└─ Tanygnathus

└─── Tanygnathus gramineus (Black-lored parrot)

└─── Tanygnathus lucionensis (Blue-naped parrot)

└─── Tanygnathus megalorynchos (Great-billed parrot)

└─── Tanygnathus sumatranus (Blue-backed parrot)