A phylogenetic analysis of thalattosaurs published in 2013 found Concavispina to be the closest relative of Xinpusaurus. Below is a cladogram based on that analysis:
| Identifier (URI) | Rank |
|---|---|
| dbkwik:resource/capb9xPYl_KpUJ4EX5v8Yw== | 5.88129e-14 |
| dbr:Xinpusaurus | 5.88129e-14 |