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Xenovenator espinosai Rivera-Sylva, Aguillón-Martinez, Flores-Ventura, Sánchez-Uribe, Guzman-Gutierrez & Longrich, 2026DOI: doi.org/10.3390/d18010038AbstractDinosaurs repea...
Xenovenator espinosai Rivera-Sylva, Aguillón-Martinez, Flores-Ventura, Sánchez-Uribe, Guzman-Gutierrez & Longrich, 2026DOI: doi.org/10.3390/d18010038AbstractDinosaurs repeatedly evolved adaptations for sexual selection over their 150-million year history, including adaptations for display and intraspecific combat. Adaptations for intraspecific combat have not previously been described in non-avian maniraptorans. We report a troodontid from the Campanian Cerro del Pueblo Formation of Coahuila, Mexico, showing a thickened and domed skull roof. The cranium is domed and bones are extremely thick, a morphology convergent on that of Pachycephalosauridae. Referred specimens show less thickening or doming, suggesting ontogenetic changes or perhaps sexual dimorphism. The holotype shows fusion of the frontal midline suture and tightly interdigitating sutures between skull bones, and a rugose skull roof. The specializations seen here suggest adaptation for intraspecific combat, specifically head-butting as hypothesized for pachycephalosaurids and pachyrhinosaurin ceratopsids. Repeated evolution of elaborate weapons and display features in the Cretaceous suggests that sexual selection became increasingly important in dinosaur evolution during the Cretaceous.Keywords: Dinosauria; Theropoda; Maniraptora; Troodontidae; Cretaceous; Campanian; Laramidia; sexual selection; intraspecific combatSaurischia Seeley, 1888 Theropoda Marsh, 1881 Avetheropoda Paul, 1988 Coelurosauria Von Huene 1914 Maniraptora Gauthier 1986 Deinonychosauria Colbert and Russell, 1969 Troodontidae Gilmore, 1924 Troodontinae van der Reest and Currie, 2017 Troodontini n. tax.Xenovenator gen. nov.Diagnosis. Troodontid characterized by thick frontals, anterior displacement of frontal postorbital processes relative to the parietal suture, broad and transversely arched interfrontal ridge, broad frontal-lacrimal suture.Etymology. Greek xenos, ‘strange’ + Latin venator, ‘hunter’.Xenovenator espinosai sp. nov. Holotype. CPC 2973, braincase including frontals, parietals, orbitosphenoids, laterosphenoids, exoccipitals, prootics, basisphenoid, basioccipital (Figure 4, Figure 5, Figure 6, Figure 7 and Figure 8). Etymology. The species name honors Luis Espinosa, a pioneer in the study of Mexican dinosaurs and mentor to many generations of paleontologists.Diagnosis. Xenovenator characterized by the following characters (* = autapomorphy): frontals extensively fused; frontals, parietals, and other cranial bones with strongly interdigitating sutures *; strong doming of frontals *; frontals and parietals massive (up to 12 mm thick) *, thickening well-developed anteriorly and less well-developed in the center of the frontal *; dorsal surface of frontals and parietals rugose and striated *, nasal processes broad between lacrimals *, orbital fossae widely separated ventrally *, frontal with notch and shelf to receive posterior end of lacrimal, parietal forms narrow process inserting between frontals *; triangular parietal table *, anteroventral expansion of the orbitosphenoids and laterosphenoids to enclose braincase ventrally *.Horizon and Locality. Cerro Del Pueblo Formation, uppermost/latest Campanian (Figure 3), Coahuila, Mexico. CPC 2973 and CPC 3112 are from the La Parrita locality, 54 km west of Saltillo; municipality of General Cepeda, Coahuila, Mexico. CPC 3112 is from the Ejido Trincheras locality, 109 km west of Saltillo, municipality of Parras de la Fuente, Coahuila, Mexico (Figure 2). Hector E. Rivera-Sylva, Martha C. Aguillón-Martinez, Jose Flores-Ventura, Ivan E. Sánchez-Uribe, Jose Ruben Guzman-Gutierrez and Nicholas R. Longrich. 2026. A Thick-Skulled Troodontid Theropod from the Late Cretaceous of Mexico. Diversity. 18(1), 38. DOI: doi.org/10.3390/d18010038 [9 January 2026]
Topics:
dinosaur
'open access'
2026
coelurosauria
cretaceous
dinosaur: north america
maniraptora
mexico
north america
paleontology - palaeontology
Even temporary spikes in blood glucose during pregnancy could have a negative effect on a developing fetus, potentially causing their pancreas to over-produce insulin. Medscape Medical News
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L'association L'Enfant Bleu a annoncé jeudi avoir déposé des plaintes déontologiques contre trois médecins qui, dans le cadre de leurs responsabilités au Conseil de l'Ordre du Finistère, ont laissé...
L'association L'Enfant Bleu a annoncé jeudi avoir déposé des plaintes déontologiques contre trois médecins qui, dans le cadre de leurs responsabilités au Conseil de l'Ordre du Finistère, ont laissé exercer le pédocriminel Joël Le Scouarnec malgré une condamnation pour détention d'images pédopornographiques.
L'ex-chirurgien septuagénaire a été condamné en mai 2025 par la cour criminelle du Morbihan à 20 ans de réclusion pour des violences sexuelles sur 298 victimes, la plupart des patients mineurs et en "état d'endormissement" au moment des faits.
Déjà en 2005, il avait été condamné à quatre mois de prison avec sursis pour avoir téléchargé des images mettant en scène des violences sexuelles commises sur des enfants par des adultes.
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santé
trois
d'ontologiques
plaintes
scouarnec
affaire
science
Despite recent legal reforms and increased emphasis on upholding workplace conduct policies, most people who experience sexual harassment at work still do not report it.