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At Tanis, scientists studied the remains of three sturgeons and three paddlefish, using in particular high-resolution X-ray tomographic analysis from the Grenoble European Synchrotron (ESRF). They first established that the fish had indeed perished in the seiche episode, which was accompanied by a rain of glass spherules... https://www.cnn.com/2022/02/23/world/asteroid-dinosaur-extinction-spring-scn/index.html The research is described in a paper published Wednesday (Dec. 8) in the journal Scientific Reports.
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I've always loved living fossils, especially the fish. They are relics of an age long lost, offering us a glimpse of an incredible prehistoric world. Some are enigmas that survived countless extinction events since the Devonian. Others are majestic predators that swam alongside the dinosaurs. Let me present my collection of living fossil fishes from the Mesozoic and before. I will begin with one of the most famous of all - the coelacanth Coelacanth Species: Whiteia woodwardi Age: 252.3 - 251.3 mya | early Triassic Formation: Diego Basin; Middle Sakamena Formation Locality: Ambilobe, Madagascar First appearance: Eoachtinistia foreyi was found 360 million years ago in Australia Paddlefish Species: Protopsephurus liui Age: 125.5 - 112.5 mya | early Cretaceous Formation: Yixian Formation Locality: Lingyuan City, Liaoning First appearance: This is the oldest known species Sturgeon Species: Peipiaosteus fengningensis Age: 125.5 - 120 mya | early Cretaceous Formation: Jehol Biota Locality: Chifeng, Nei Mongol First appearance: Multiple species e.g. Yanosteus longidorsalis found since 125 million years ago in China Pipefish Species: Hipposygnathus sp. Age: 28.1 - 13.8 mya | Oliogocene - Miocene Formation: Monterey Formation Locality: Santa Ynez Valley, California, USA First appearance: Solenostomidae species were found 55.8 million years ago in Italy Note: Although most of this collection only includes fishes that existed since the Mesozoic or later, I made an exception for the pipefish as their order, syngnathiform, existed since the late Cretaceous
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The enormous and prehistoric Chinese Paddlefish is officially extinct
Oxytropidoceras posted a topic in Fossil News
One of World's Largest Freshwater Fish May Be First Official Extinction of 2020 By Stephanie Pappas, Live Science, January 07, 2020 https://www.livescience.com/chinese-paddlefish-extinct.html This enormous ancient fish is officially extinct By Eva Frederick, Science, Jan. 7, 2020 https://www.sciencemag.org/news/2020/01/enormous-ancient-fish-officially-extinct The paper is: Zhang, H., Jarić, I., Roberts, D.L., He, Y., Du, H., Wu, J., Wang, C. and Wei, Q., 2020. Extinction of one of the world's largest freshwater fishes: Lessons for conserving the endangered Yangtze fauna. Science of The Total Environment, 710, p.136242. https://www.sciencedirect.com/science/article/pii/S0048969719362382 Yours, Paul H.- 5 replies
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From the album: Vertebrates
Protopsephurus liui LU, 1994 Early Cretaceous Linyuan Liaoning PRC Length is around 71cm- 1 comment
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Taxonomy from Grande et al. 2002. The order of Acipenseriformes (Sturgeon-like fishes) both includes sturgeons (Acipenseridae) and paddlefish (Polyodontidae). At least three Sturgeon-like fishes (Acipenseriformes) can be found in the Jiufotang Formation (Jehol Group) and in the Yixian Formation in western Liaoning and northern Hebei Province China: Peipiaosteus pani Liu and Zhou 1965, Protopsephurus liui Lu, 1994 and Yanosteus longidorsalis Jin, Tian, Yang & Deng, 1995. The Jiufotang Formation - where Peipiaosteus comes from - is dated to about 120.3+/-0.7 million years ago, which was during the Aptian age of the Cretaceous; the Yixian Formation - where this Protopsephurus liui and Y. longidorsalis can be found - is dated slightly older, around 125-121 million years ago (Barremian-early Aptian). Protopsephurus liui Lu 1994 is both the oldest and the most primitive paddlefish (Polyodontidae) known. Paddlefishes remain one of the strongest indicators of historical biogeographic connection between East Asia and North America. Fossil and living members of this family date from the Early Cretaceous and Recent in China, and from the Late Cretaceous, Early Paleocene, Early Eocene and Recent in North America. The total length of Protopsephurus normally is in the range of 20 to 30cm, but can exceed 1m. Line drawing from Grande et al 2002, p. 218: References: Lu, L. (1994): A new paddlefish from the Upper Jurassic of Northeast China. Vertebrata PalAsiatica, 1994, Vol. 32, Teil 2, pp134-142 Liu, H., Zhou J. (1965): A new Sturgeon from the Upper Jurassic of Liaoning, North China. Vertebrata PalAsiatica Vol. 9, No. 3, 1965, p. 237 ff. Zhou, Z.(1992): Review on Peipiaosteus based on new materials of P. pani. Vertebrata PalAsiatica Vol 30, No. 2, pp 85-101. Grande, L., Jin, F., Yabumoto, Y. & Bemis, W. E. (2002) Protopsephurus liui, a well-preserved primitive paddlefish (Acipenseriformes: Polyodontidae) from the Lower Cretaceous of China, Journal of Vertebrate Paleontology, 22:2, 209-237, DOI: 10.1671/0272-4634(2002)022[0209:PLAWPP]2.0.CO;2
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