Though Diamantinasauria has been recovered consistently as a monophyletic clade, its placement within Titanosauria has fluctuated, meaning that while it appears to be relatively stable as a clade, its content and definition may change with further analysis and study.[2]
In their 2024 description of the basal titanosaur Gandititan, Han et al. recovered the Diamantinasauria as the sister taxon to the Titanosauria, rather than within it.[3] Later that year, Beeston et al. published a review of the sauropod fossil material found in the Winton Formation and described additional new material. They suggested that Australotitan may represent a junior synonym of the contemporary Diamantinasaurus, and recovered Wintonotitan within the Diamantinasauria for the first time. Their phylogenetic analyses also placed the Diamantinasauria as the sister taxon to the Titanosauria within the Somphospondyli. Their results are displayed in the cladogram below:[4]
^Carballido, J.L.; Otero, A.; Mannion, P.D.; Salgado, L.; Moreno, A.P. (2022). "Titanosauria: A Critical Reappraisal of Its Systematics and the Relevance of the South American Record". In Otero, A.; Carballido, J.L.; Pol, D. (eds.). South American Sauropodomorph Dinosaurs. Record, Diversity and Evolution. Springer. pp. 269–298. doi:10.1007/978-3-030-95959-3. ISBN978-3-030-95958-6. ISSN2197-9596. S2CID248368302.
^Han, F.; Yang, L.; Lou, F.; Sullivan, C.; Xu, X.; Qiu, W.; Liu, H.; Yu, J.; Wu, R.; Ke, Y.; Xu, M.; Hu, J.; Lu, P. (2024). "A new titanosaurian sauropod, Gandititan cavocaudatus gen. et sp. nov., from the Late Cretaceous of southern China". Journal of Systematic Palaeontology. 22 (1). 2293038. Bibcode:2024JSPal..2293038H. doi:10.1080/14772019.2023.2293038.
