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Intraskeletal histovariability and skeletochronology in an ornithopod dinosaur from the Maestrazgo Basin (Teruel, Spain).
J Anat
January 2025
Departamento de Ciencias de la Tierra, Aragosaurus-IUCA: Recursos Geológicos y Paleoambientes, Universidad de Zaragoza, Zaragoza, Spain.
Ornithopods are an extinct group of dinosaurs that were particularly abundant and diverse in the Cretaceous of the Iberian Peninsula, and whose abundance in the Maestrazgo Basin has allowed numerous taxa to be identified over the last decade. Many of these fossil remains are still taxonomically indeterminate and require a more detailed study on both a macroscopic and microscopic scale. In this contribution, an osteohistological analysis is carried out on a partial skeleton-composed of five incomplete vertebrae, two dorsal ribs, an ischium, a fibula, and a tibia-found in the province of Aliaga (Teruel, NE Spain).
View Article and Find Full Text PDFStudy of Mitogenomes Provides Implications for the Phylogenetics and Evolution of the Infraorder Muscomorpha in Diptera.
Ecol Evol
January 2025
Chongqing Key Laboratory of Vector Control and Utinization; Institute of Entomology and Molecular Biology, College of Life Sciences Chongqing Normal University Chongqing China.
The Muscomorpha is one of the most species-rich brachyceran groups in Diptera, with many species serving as important disease vectors; however, its high-level phylogenetic relationships have long been controversial and unsolved. This study comparatively analyzed the characteristics of mitogenomes of 131 species that represent 18 superfamilies in Muscomorpha, in which mitogenomes of 16 species have been newly sequenced and annotated, demonstrating that their gene composition, order, AT bias, length variation, and codon usage are consistent with documented dipteran mitogenomes. The phylogenetic topologies demonstrated that the robustness of Muscomorpha and major clades within Muscomorpha are monophyletic: Cyclorrhapha, Schizophora, and Calyptratae.
View Article and Find Full Text PDFReduced contribution of sulfur to the mass extinction associated with the Chicxulub impact event.
Nat Commun
January 2025
Atomic and Mass Spectrometry-A&MS research unit, Department of Chemistry, Ghent University, Ghent, Belgium.
The Chicxulub asteroid impact event at the Cretaceous-Paleogene (K-Pg) boundary ~66 Myr ago is widely considered responsible for the mass extinction event leading to the demise of the non-avian dinosaurs. Short-term cooling due to massive release of climate-active agents is hypothesized to have been crucial, with S-bearing gases originating from the target rock vaporization considered an important driving force. Yet, the magnitude of the S release remains poorly constrained.
View Article and Find Full Text PDFClick beetle larvae from Cretaceous Burmese amber represent an ancient Gondwanan lineage.
Sci Rep
January 2025
Department of Geoinformatics, Faculty of Science, Palacky University, 17. listopadu 50, 77146, Olomouc, Czech Republic.
The click beetles (Elateridae) represent the major and well-known group of the polyphagan superfamily Elateroidea. Despite a relatively rich fossil record of Mesozoic Elateridae, only a few species are described from the Upper Cretaceous Burmese amber. Although Elateridae spend most of their lives as larvae, our knowledge on immature stages of this family is limited, which is especially valid for the fossils.
View Article and Find Full Text PDFTerrestrial evidence for volcanogenic sulfate-driven cooling event ~30 kyr before the Cretaceous-Paleogene mass extinction.
Sci Adv
December 2024
Department of Earth and Environmental Sciences, University of Manchester, Manchester, UK.
Alongside the Chicxulub meteorite impact, Deccan volcanism is considered a primary trigger for the Cretaceous-Paleogene (K-Pg) mass extinction. Models suggest that volcanic outgassing of carbon and sulfur-potent environmental stressors-drove global temperature change, but the relative timing, duration, and magnitude of such change remains uncertain. Here, we use the organic paleothermometer MBT' and the carbon-isotope composition of two K-Pg-spanning lignites from the western Unites States, to test models of volcanogenic air temperature change in the ~100 kyr before the mass extinction.
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