Theropods and sauropods from Campanian–Maastrichtian Bagua Basin of Peru (free pdf)
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Ben Creisler
Sep 6, 2025, 2:15:28 PMSep 6
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Ben Creisler
A new paper:
Giancarlo J. Olmedo-Romaña, Jeffrey A. Wilson Mantilla, Julia V. Tejada, Pierre Olivier Antoine, Manuel A. Burga-Castillo, Angélica V. Aliaga-Castillo, Rafael Varas-Malca, Aldo Benites-Palomino, and Rodolfo Salas-Gismondi (2025)
Theropod and sauropod dinosaurs from the Campanian–Maastrichtian Bagua Basin of Perú, including the first possible report of Spinosauridae in western South America.
Ameghiniana (advance online publication)
doi: 10.5710/AMGH.13.02.2025.3627
https://www.ameghiniana.org.ar/index.php/ameghiniana/libraryFiles/downloadPublic/141
We provide the first detailed description of osteo-dental non-avian dinosaur fossils from the Fundo El Triunfo Formation in the Bagua Basin (Campanian– Maastrichtian) in northwestern Perú. The material described in this work includes three isolated teeth, which we refer to Spinosauridae based on the presence of diagnostic dental features, as well as abundant though fragmentary postcranial material that we refer to Titanosauria. A multivariate analysis was performed and provide additional support for referral of the teeth to Spinosauridae. These teeth possibly expand the geographical distribution and temporal range of Spinosauridae, representing their first record in western South America and the youngest remains of the group. The new material also provides key information on the size and distribution of titanosaurs in northern South America during the latest Cretaceous. These findings increase the very scarce record of non-avian dinosaur skeletal material in Perú, emphasizing the country's potential for future paleontological exploration.
Free pdf:
Giancarlo J. Olmedo-Romaña, Jeffrey A. Wilson Mantilla, Julia V. Tejada, Pierre Olivier Antoine, Manuel A. Burga-Castillo, Angélica V. Aliaga-Castillo, Rafael Varas-Malca, Aldo Benites-Palomino, and Rodolfo Salas-Gismondi (2025)
Theropod and sauropod dinosaurs from the Campanian–Maastrichtian Bagua Basin of Perú, including the first possible report of Spinosauridae in western South America.
Ameghiniana (advance online publication)
doi: 10.5710/AMGH.13.02.2025.3627
https://www.ameghiniana.org.ar/index.php/ameghiniana/libraryFiles/downloadPublic/141
We provide the first detailed description of osteo-dental non-avian dinosaur fossils from the Fundo El Triunfo Formation in the Bagua Basin (Campanian– Maastrichtian) in northwestern Perú. The material described in this work includes three isolated teeth, which we refer to Spinosauridae based on the presence of diagnostic dental features, as well as abundant though fragmentary postcranial material that we refer to Titanosauria. A multivariate analysis was performed and provide additional support for referral of the teeth to Spinosauridae. These teeth possibly expand the geographical distribution and temporal range of Spinosauridae, representing their first record in western South America and the youngest remains of the group. The new material also provides key information on the size and distribution of titanosaurs in northern South America during the latest Cretaceous. These findings increase the very scarce record of non-avian dinosaur skeletal material in Perú, emphasizing the country's potential for future paleontological exploration.
Ben Creisler
Dec 13, 2025, 4:20:21 PM (5 days ago) Dec 13
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Ben Creisler
A response to the earlier paper:
Free pdf:
Chris T. Barker, Darren Naish and Neil J. Gostling (2025)
Insufficient evidence for spinosaurid survival into the latest Cretaceous: a comment on Olmedo-Romaña et al. (2025)
Ameghiniana (advance online publication)
doi: 10.5710/AMGH.10.12.2025.3673
https://www.ameghiniana.org.ar/index.php/ameghiniana/libraryFiles/downloadPublic/157
The recent description of putative spinosaurid teeth from the latest Cretaceous (Campanian-Maastrichtian) of Peru by Olmedo-Romaña et al. (2025) has interesting implications for our understanding these atypical dinosaur predators. Such a late occurrence of the clade would require a temporal range extension of some 15 million years, suggesting they survived the faunal turnover events experienced during the “mid”-Cretaceous and persisted for some time beyond the Cenomanian. This commentary reviews the taxonomic affinities of these specimens. We demonstrate that their morphology is inconsistent with spinosaurid dentition and that they lack key characters exhibited by the clade, with our revised interpretation instead favouring crocodylomorph affinities for these specimens. Accordingly, we urge caution in the interpretation of conidont tooth morphologies given that multiple semi-aquatic and aquatic amniote lineages independently converged on this dental morphotype. Spinosaurids did not, therefore, survive into the latest Cretaceous and instead appear to go extinct around the Cenomanian-Turonian boundary, the drivers of which remain unclear.
Insufficient evidence for spinosaurid survival into the latest Cretaceous: a comment on Olmedo-Romaña et al. (2025)
Ameghiniana (advance online publication)
doi: 10.5710/AMGH.10.12.2025.3673
https://www.ameghiniana.org.ar/index.php/ameghiniana/libraryFiles/downloadPublic/157
The recent description of putative spinosaurid teeth from the latest Cretaceous (Campanian-Maastrichtian) of Peru by Olmedo-Romaña et al. (2025) has interesting implications for our understanding these atypical dinosaur predators. Such a late occurrence of the clade would require a temporal range extension of some 15 million years, suggesting they survived the faunal turnover events experienced during the “mid”-Cretaceous and persisted for some time beyond the Cenomanian. This commentary reviews the taxonomic affinities of these specimens. We demonstrate that their morphology is inconsistent with spinosaurid dentition and that they lack key characters exhibited by the clade, with our revised interpretation instead favouring crocodylomorph affinities for these specimens. Accordingly, we urge caution in the interpretation of conidont tooth morphologies given that multiple semi-aquatic and aquatic amniote lineages independently converged on this dental morphotype. Spinosaurids did not, therefore, survive into the latest Cretaceous and instead appear to go extinct around the Cenomanian-Turonian boundary, the drivers of which remain unclear.
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