The oldest-known Lestidae (Odonata) from the late Eocene of Tibet: palaeoclimatic implications - Sorbonne Université Access content directly
Journal Articles Geological Magazine Year : 2022

The oldest-known Lestidae (Odonata) from the late Eocene of Tibet: palaeoclimatic implications

Guoqing Xia
Daran Zheng
  • Function : Author
Régis Krieg-Jacquier
  • Function : Author
Qiushuang Fan
  • Function : Author
Yun Chen
  • Function : Author
André Nel

Abstract

Abstract Terrestrial fossils from the Palaeogene of Tibet could help us to better understand the past climate and environment in this area. We herein report a new late Eocene non-marine fossil site from southern Nima Basin, central Tibet, SW China, including abundant insects and fishes. These fossils are similar to those from the late Eocene (∼39.5–37 Ma) Lunpola–Nima sediment depo-centres in sharing the dominating aquatic bug Aquarius lunpolaensis and cyprinid fishes. Chalcolestes tibetensis sp. nov., the oldest representative of the modern family Lestidae, is described. Lestidae were previously only recorded in Western Europe, and the oldest records were from the uppermost Eocene of France and the UK. The present discovery demonstrates that Lestidae already had a broad distribution during the Eocene and probably originated much earlier. The recent representatives of Chalcolestes occur in the low-altitude ponds or lakes of Western Palaearctic. Together with the other freshwater fossils in this site, this new discovery indicates a humid climate and low altitude for the Nima Basin and nearby basins in the middle part of the Bangong Nujiang suture zone.Terrestrial fossils from the Palaeogene of Tibet could help us to better understand the past climate and environment in this area. We herein report a new late Eocene non-marine fossil site from southern Nima Basin, central Tibet, SW China, including abundant insects and fishes. These fossils are similar to those from the late Eocene (∼39.5–37 Ma) Lunpola–Nima sediment depo-centres in sharing the dominating aquatic bug Aquarius lunpolaensis and cyprinid fishes. Chalcolestes tibetensis sp. nov., the oldest representative of the modern family Lestidae, is described. Lestidae were previously only recorded in Western Europe, and the oldest records were from the uppermost Eocene of France and the UK. The present discovery demonstrates that Lestidae already had a broad distribution during the Eocene and probably originated much earlier. The recent representatives of Chalcolestes occur in the low-altitude ponds or lakes of Western Palaearctic. Together with the other freshwater fossils in this site, this new discovery indicates a humid climate and low altitude for the Nima Basin and nearby basins in the middle part of the Bangong Nujiang suture zone.
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Dates and versions

hal-04020062 , version 1 (08-03-2023)

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Guoqing Xia, Daran Zheng, Régis Krieg-Jacquier, Qiushuang Fan, Yun Chen, et al.. The oldest-known Lestidae (Odonata) from the late Eocene of Tibet: palaeoclimatic implications. Geological Magazine, 2022, 159 (4), pp.511-518. ⟨10.1017/S0016756821001102⟩. ⟨hal-04020062⟩
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