New hadrosaurid dinosaurs from the middle Campanian (Upper Cretaceous) of Sonora (Mexico) extend the South American kritosaurin lineage to southern Laramidia
Duarte-Bigurra, Ruben (Universidad Nacional Autónoma de México)
Vicente, Alba (Institut Català de Paleontologia Miquel Crusafont)
Gutiérrez-Blando, Cirene (Colegio de Postgraduados (Mèxic))
Serrano-Brañas, Claudia Inés (Benemérita Escuela Normal de Coahuila (Mexico))
Wagner, Jonathan R.
Prieto-Márquez, Albert (Institut Català de Paleontologia Miquel Crusafont)

Data:	2026
Resum:	The non-marine deposits of the Campanian–early Maastrichtian Cabullona Group (north-eastern Sonora, north-western Mexico) have yielded abundant fossils of continental vertebrates, including dinosaurs. However, this dinosaur fauna has yet to be studied in detail. We describe three partial hadrosaurid specimens from two localities (Arroyo del Alamito and Puerto Viejo) in the Fronteras Municipality of Sonora. All three localities correspond to the middle Campanian strata of the lower part of the Fronteras section of the Cabullona Group. The specimens are represented by partial axial and appendicular elements. The most complete individual (2997 PM 1) was collected at Puerto Viejo and consists of several axial elements, a partially complete pelvic girdle and hindlimb fragments. The parsimony phylogenetic analysis positioned the three Fronteras specimens deeply nested within the speciose saurolophine tribe Kritosaurini, as members of a subclade so far restricted to Patagonia, Argentina (here informally referred to as ‘secernosaurs’). Thus, the Fronteras hadrosaurids represent the first record of secernosaurs outside South America, greatly extending their biogeographical distribution to Late Cretaceous southern Laramidia. Inference of ancestral areas for the clades recovered in the phylogeny supports the hypothesis that hadrosauroids dispersed to South America via Southern Laramidia.
Ajuts:	Agencia Estatal de Investigación PID2024-161658NB-I00 Generalitat de Catalunya 2022/BP-00179 Generalitat de Catalunya 2021/SGR-00620 Generalitat de Catalunya 2021/SGR-0119
Nota:	Altres ajuts: A. V.’s and A. P-M. wants to acknowledge the additional support provided by the Generalitat de Catalunya by means of the CERCA Programme.
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Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Cretaceous ; Dinosauria ; Hadrosauridae ; Laramidia ; Mexico ; evolution
Publicat a:	Journal of systematic palaeontology, Vol. 24, Num. 1 (2026) , ISSN 1478-0941

DOI: 10.1080/14772019.2026.2656218

Disponible a partir de: 2027-12-30 75 p, 31.0 MB

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