After Carroll, 1988 and McKenna & Bell, 1997

<==o †Astrapotheria
   |--o †Trigonostylopidae
   |  |-- †Albertogaudryia [Scabellia]
   |  |-- †Shecenia U. Paleoc
   |  |-- †Teragonostylops
   |  `-- †Trigonostylops [Chiodon, Staurodon]
   `--o †Astrapotheriidae
      |-- †Astraponotus [Notamynus]
      |-- †Astrapothericulus
      |-- †Astrapotherium
      |-- †Parastrapotherium
      |-- †Scaglia
      |-- †Synastrapotherium
      `-- †Xenastrapotherium

Reference(s):