Monday, February 5th, 2024

Time	Event
9:00a	[PaleoMammalogy • 2024] Patagomaia chainko • A large therian Mammal from the Late Cretaceous of South America Patagomaia chainko Chimento, Agnolín, García-Marsà, Manabe, Tsuihiji & Novas, 2024   DOI: 10.1038/s41598-024-53156-3 Abstract Theria represent an extant clade that comprises placental and marsupial mammals. Here we report on the discovery of a new Late Cretaceous mammal from southern Patagonia, Patagomaia chainko gen. et sp. nov., represented by hindlimb and pelvic elements with unambiguous therian features. We estimate Patagomaia chainko attained a body mass of 14 kg, which is considerably greater than the 5 kg maximum body mass of coeval Laurasian therians. This new discovery demonstrates that Gondwanan therian mammals acquired large body size by the Late Cretaceous, preceding their Laurasian relatives, which remained small-bodied until the beginning of the Cenozoic. Patagomaia supports the view that the Southern Hemisphere was a cradle for the evolution of modern mammalian clades, alongside non-therian extinct groups such as meridiolestidans, gondwanatherians and monotremes.  Patagomaia chainko holotype, MPM-PV-23365   (a) fragments of the left pelvis; (b) silhouette and skeletal scheme with details of the preserved bones; (c) distal end of the left ulna; (d) proximal end of the right femur and distal end of the left femur; e, proximal half of the left tibia. Scale bar: 20 mm. Class Mammalia Linnaeus 1758 Subclass Theria Parker and Haswell, 1897 Patagomaia nov. gen. Generic diagnosis: Patagomaia is a large mammal (~ 14 kg) distinguished by the following unique combination of character states: fused acetabulum with a complete rim lacking a dorsal emargination; femur with subspherical head having a well-defined fovea capitis; femur head separated from the rest of the bone by a well-defined and medially tilted neck; lesser trochanter of femur small and located on the posteromedial surface of the shaft; distal end of femur with nearly symmetrical distal condyles and reduced epicondyles. Patagomaia further differs from other Mesozoic mammals in having the autapomorphic condition of a thick, well-defined, and obliquely oriented intercondylar ridge delimiting a deep fossa at the distal end of the femur.   Etymology: Patago, from Patagonia; maia, mother in Greek. Patagomaia chainko sp. nov. Etymology: The species name is derived from the Aonikenk language: chaink, large and ko, bone.   Nicolás R. Chimento, Federico L. Agnolín, Jordi García-Marsà, Makoto Manabe, Takanobu Tsuihiji and Fernando E. Novas. 2024. A large therian Mammal from the Late Cretaceous of South America. Scientific Reports 14: 2854. DOI: 10.1038/s41598-024-53156-3 (Comment on this)
9:43a	[Entomology • 2022] Panorpa fengyanga & P. zhuohengi • Review of the Panorpa wormaldi group (Mecoptera: Panorpidae), with Descriptions of Two New Species    Panorpa fengyanga  Wang & Suzuki, 2022 DOI: 10.5852/ejt.2022.794.1651 ABSTRACT Panorpa Linnaeus, 1758 is the largest genus in the scorpionfly family Panorpidae. In this paper, a taxonomic review of the Panorpa wormaldi group is provided, with two new species described from China: Panorpa fengyanga Wang & Suzuki, sp. nov. from Zhejiang, and Panorpa zhuohengi Wang & Suzuki, sp. nov. from Guangdong. The male of Panorpa implicata Cheng, 1957 is discovered and described for the first time. A distributional map and keys to species are also provided for this group. Species number in this group is updated from 17 to 19. In addition, their biogeographical and evolutionary implications are briefly discussed.   Keywords: biodiversity, fauna, Oriental Region, scorpionflies, new species   Ji-Shen Wang and Tomoya Suzuki. 2022. Review of the Panorpa wormaldi group (Mecoptera: Panorpidae), with Descriptions of Two New Species. European Journal of Taxonomy. 794(1), 18–39. DOI: 10.5852/ejt.2022.794.1651 (Comment on this)

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