Parent: Tanygnathus

└─ Tanygnathus sumatranus (Blue-backed parrot)

└─── Tanygnathus sumatranus burbidgii

└─── Tanygnathus sumatranus duponti

└─── Tanygnathus sumatranus everetti

└─── Tanygnathus sumatranus freeri

└─── Tanygnathus sumatranus sumatranus