Ben Creisler
Some recent non-dino papers with free pdfs:
Neovulpavus mccarrolli n. sp.
Susumu Tomiya, Shawn P. Zack, Michelle Spaulding Âand John J. Flynn (2021)
Carnivorous mammals from the middle Eocene Washakie Formation, Wyoming, USA, and their diversity trajectory in a post-warming world.
Journal of Paleontology 95 , Supplement S82: 1 - 115
DOI: https://doi.org/10.1017/jpa.2020.74
https://www.cambridge.org/core/journals/journal-of-paleontology/article/carnivorous-mammals-from-the-middle-eocene-washakie-formation-wyoming-usa-and-their-diversity-trajectory-in-a-postwarming-world/B79C637FED501FEA45F732D51815333C
The middle Eocene Washakie Formation of Wyoming, USA, provides a rare window, within a single depositional basin, into the faunal transition that followed the early Eocene warming events. Based on extensive examination, we report a minimum of 27 species of carnivorous mammals from this formation, more than doubling the previous taxic count. Included in this revised list are a new species of carnivoraform, Neovulpavus mccarrolli n. sp., and up to ten other possibly new taxa. Our cladistic analysis of early Carnivoraformes incorporating new data clarified the array of middle Eocene taxa that are closely related to crown-group Carnivora. These anatomically relatively derived carnivoraforms collectively had an intercontinental distribution in North America and east Asia, exhibiting notable variations in body size and dental adaptation. This time period also saw parallel trends of increase in body size and dental sectoriality in distantly related lineages of carnivores spanning a wide range of body sizes. A new, model-based Bayesian analysis of diversity dynamics accounting for imperfect detection revealed a high probability of substantial loss of carnivore species between the late Bridgerian and early Uintan North American Land Mammal âAgesâ, coinciding with the disappearance of formerly common mammals such as hyopsodontids and adapiform primates. Concomitant with this decline in carnivore diversity, the Washakie vertebrate fauna underwent significant disintegration, as measured by patterns of coordinated detection of taxa at the locality level. These observations are consistent with a major biomic transition in the region in response to climatically induced opening-up of forested habitats.
UUID: http://zoobank.org/9162f1a6-a12c-4d55-ba1d-dc66e8cda261
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Free pdf:
Arnaud BRIGNON (2021)
Les Thalattosuchia jurassiques de Normandie des collections Vautier et MoriÃreâ: contexte historique et redÃcouverte des plastotypes.
[The Thalattosuchia from the Jurassic of Normandy in the collections of Abel Vautier (1794-1863) and Pierre-Gilles MoriÃre (1817-1888): historical context and rediscovery of the plastotypes]
Geodiversitas 43(6): 151-186 (text in French)
doi: https://doi.org/10.5252/geodiversitas2021v43a6
https://sciencepress.mnhn.fr/en/periodiques/geodiversitas/43/6
urn:lsid:zoobank.org:pub:D75BC6C0-6AD0-4826-AF14-13F22F41DF4B
Abel Vautier (1794-1863) had set up an eclectic private museum in Caen, in which an important palaeontological collection was kept. He had acquired several remarkable specimens of Jurassic marine reptiles from Normandy (Ichthyosauria, Plesiosauria and Thalattosuchia). After his death, these specimens were purchased in November 1863 by Jacques-Amand Eudes-Deslongchamps and in 1935 they were included in the collections of the Faculty of Sciences of Caen. Another personality from Caen, Pierre-Gilles MoriÃre (1817-1888), had also collected several important specimens of Thalattosuchia from the Jurassic of Normandy. Unlike Vautier, MoriÃre did not seek to build a private collection and he deposited his finds directly at the Faculty of Caen. All the pieces collected by Vautier and MoriÃre nevertheless suffered the same fate and were destroyed in the bombardments of Caen in 1944. This article traces the history of the most emblematic specimens of these collections, notably, the holotype of "Metriorhynchus" blainvillei (J.-A. Eudes-Deslongchamps, 1867) found in the Lower Callovian of Sannerville (Calvados) in 1844, the holotype of Deslongchampsina larteti (J.-A. Eudes-Deslongchamps, 1866) discovered before 1853 in the Calcaire de Caen (Middle Bathonian) at Fleury-sur-Orne, the holotype of "Metriorhynchus" brachyrhynchus (J.-A. Eudes-Deslongchamps, 1867) found in 1864 in the Callovian of Mesnil de Bavent (Calvados), and finally a complete skull of Teleidosaurus calvadosii (J.-A. Eudes-Deslongchamps, 1866), designated here as the lectotype of this species, discovered in 1864 in the Calcaire de Caen (Middle Bathonian) at Fleury-sur-Orne. Under the impetus of Eudes-Deslongchamps, plaster casts of these specimens were made between 1866 and 1868 by Jean-Benjamin Stahl, head of the moulding workshop of the MusÃum national dâHistoire naturelle, Paris. They were distributed to various museums and science faculties in France. Some plastotypes of "Metriorhynchus' blainvillei, Deslongchampsina larteti, "Metriorhynchus" brachyrhynchus, and Teleidosaurus calvadosii, whose origin had long been forgotten, have been rediscovered in several French public collections.
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Free pdf:
Guoshan Li, Wei Liao, Sheng Li, Yongbiao Wang & Zhongping Lai (2021)
Different triggers for the two pulses of mass extinction across the Permian and Triassic boundary.
Scientific Reports 11, Article number: 6686
doi: https://doi.org/10.1038/s41598-021-86111-7
https://www.nature.com/articles/s41598-021-86111-7
Free pdf:
https://www.nature.com/articles/s41598-021-86111-7.pdf
Widespread ocean anoxia has been proposed to cause biotic mass extinction across the PermianâTriassic (PâTr) boundary. However, its temporal dynamics during this crisis period are unclear. The Liangfengya section in the South China Block contains continuous marine sedimentary and fossil records. Two pulses of biotic extinction and two mass extinction horizons (MEH 1 & 2) near the PâTr boundary were identified and defined based on lithology and fossils from the section. The data showed that the two pulses of extinction have different environmental triggers. The first pulse occurred during the latest Permian, characterized by disappearance of algae, large foraminifers, and fusulinids. Approaching the MEH 1, multiple layers of volcanic clay and yellowish micritic limestone occurred, suggesting intense volcanic eruptions and terrigenous influx. The second pulse occurred in the earliest Triassic, characterized by opportunist-dominated communities of low diversity and high abundance, and resulted in a structural marine ecosystem change. The oxygen deficiency inferred by pyrite framboid data is associated with biotic declines above the MEH 2, suggesting that the anoxia plays an important role.
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Free pdf:
Arianny P. Storari, Taissa Rodrigues, Renan A. M. Bantim, Flaviana J. Lima & Antonio A. F. Saraiva (2021)
Mass mortality events of autochthonous faunas in a Lower Cretaceous Gondwanan LagerstÃtte.
Scientific Reports 11, Article number: 6976
doi: https://doi.org/10.1038/s41598-021-85953-5
https://www.nature.com/articles/s41598-021-85953-5
Mass mortality events are unusual in the Crato Formation. Although mayfliesâ accumulations have been previously reported from that unit, they lacked crucial stratigraphic data. Here we provide the first taphonomic analysis of a mayfly mass mortality event, from a layer 285 cm from the top of the Formation, with 40 larvae, and an overview of the general biological community structure of a three meters deep excavated profile. The only other autochthonous taxon observed in the mayfly mortality layer was the gonorynchiform fish Dastilbe. The larvae and fishes were smaller than usual in the layer 285 cm, suggesting that they lived in a shallow water column. Their excellent preservation and a lack of preferential orientation in the samples suggest an absence of significant transport. All mayflies belong to the Hexagenitidae, whose larvae lived in quiet waters. We also recovered allochthonous taxa in that layer indicative of drier weather conditions. Adjacent layers presented crystals and pseudomorphs of halite, suggesting drought and high salinity. In other layers, Dastilbe juveniles were often found in mass mortality events, associated with a richer biota. Our findings support the hypothesis that the Crato Formationâs palaeolake probably experienced seasonal high evaporation, caused by the hot climate tending to aridity, affecting the few autochthonous fauna that managed to live in this setting.
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