Fossils of Dinheirosaurus were first treated as belonging to Lourinhasaurus until new study ascertained that they were of a different genus. For some time afterwards there was still speculation that this was a mistake and that Dinheirosaurus should be regarded as a synonym to Lourinhasaurus, but even further study has now established without doubt that the two genera are definitely separate. Dinheirosaurus is regarded as being a diplodocid sauropod, similar to the North American genus Diplodocus. Lourinhasaurus however is regarded as being similar to Camarasaurus, a very different kind of sauropod. As a diplodocid, Dinheirosaurus was probably best suited to browsing upon low growing vegetation from above rather than reaching up into the trees.
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