The oldest-known Lestidae (Odonata) from the late Eocene of Tibet: palaeoclimatic implications
The oldest-known Lestidae (Odonata) from the late Eocene of Tibet: palaeoclimatic implications
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DOI：
10.1017/s0016756821001102
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发表时间：
2021-11
影响因子：
2.3
通讯作者：
Guoqing Xia;D. Zheng;Régis Krieg-Jacquier;Qiushuang Fan;Yun Chen;A. Nel
中科院分区：
文献类型：
--
作者：
Guoqing Xia;D. Zheng;Régis Krieg-Jacquier;Qiushuang Fan;Yun Chen;A. Nel
摘要西藏古近纪陆生生物化石的发现有助于我们更好地了解该地区过去的气候环境。本文报道了西藏尼玛盆地南部一个新的晚始新世非海相化石地点，包括丰富的昆虫和鱼类化石。这些化石与伦坡拉-尼玛沉积中心始新世晚期（距今39.5-37 Ma）的化石相似，都是以水生昆虫Aquarius lunpolaensis和鲤科鱼类为主。西藏小胸脂鲤Chalcolestes tibetensis sp. nov.最古老的代表现代家庭Lestidae，被描述。Lestidae以前只在西欧有记录，最古老的记录来自法国和英国的始新世。目前的发现表明，Lestidae在始新世已经有广泛的分布，可能起源更早。Chalcolestes的最近代表发生在西部古北界的低海拔池塘或湖泊中。这一新发现与该地点的其他淡水化石一起，表明班公湖-怒江缝合带中段的尼玛盆地及邻近盆地气候湿润，海拔较低。
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.