The northernmost Eurasian Miocene beavers: Euroxenomys (Castoridae, Mammalia) from Olkhon Island, Lake Baikal (Eastern Siberia).

IF 1.4 4区地球科学 Q3 BIODIVERSITY CONSERVATION

Palaeobiodiversity and Palaeoenvironments Pub Date : 2022-01-01 Epub Date: 2022-11-23 DOI:10.1007/s12549-022-00555-x

Thomas Mörs, Signe Hägglund, Margarita A Erbajeva, Nadezhda Alexeeva, Alexander A Shchetnikov, Gudrun Daxner-Höck

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Abstract

The castorid dental material described in this paper derives from Miocene, fossiliferous deposits of the Baikal rift valley, exposed at Tagay Bay on Olkhon Island in the Lake Baikal, in eastern Siberia. It consists of maxillary fragments and isolated upper and lower teeth of the small trogontheriine beaver Euroxenomys minutus (von Meyer, 1838). It is the first record of the species in Asia and at the same time the northernmost occurrence of Eurasian Miocene beavers. The magnetostratigraphic correlation of the Tagay -1 section, indicates a late Burdigalian, Early/early Middle Miocene age of ~16.5 to ~16.3 Ma that corresponds to the Mammalian Neogene zone MN4/5. The presence of E. minutus in Tagay is an indicator for an Orleanian European-Siberian bioprovince during the Mid-Miocene Climate Optimum, and for a continuous belt of humid, warm-temperate to subtropical forests, stretching from Europe to Siberia, and probably further to East and South-Eastern Asia. In Eurasia, beaver remains are an indicator of permanent water bodies, which is in agreement with the palaeoenvironment of the Tagay locality.

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最北的欧亚中新世海狸：来自贝加尔湖奥尔洪岛（东西伯利亚）的Euroxenomys（蓖麻科，哺乳动物）。

本文描述的蓖麻目牙齿材料来自中新世贝加尔裂谷的化石沉积物，出露于东西伯利亚贝加尔湖奥尔洪岛塔盖湾。该化石由小型河狸 Euroxenomys minutus（von Meyer，1838 年）的上颌残片和孤立的上下牙齿组成。这是该物种在亚洲的首次记录，同时也是欧亚中新世海狸的最北端。Tagay -1 断面的磁地层相关性表明，该断面的年代为 Burdigalian 晚期、早/中新世早期（约 16.5 至 16.3 Ma），与哺乳动物新近纪区 MN4/5 相符。小海狸在塔盖地区的出现表明，在中新世气候最适宜时期，欧洲-西伯利亚生物群落是一个奥尔良生物群落，而且从欧洲到西伯利亚，甚至可能到东亚和东南亚，是一个连续的湿润、暖温带到亚热带森林带。在欧亚大陆，海狸遗骸是永久性水体的标志，这与塔盖地区的古环境相吻合。

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来源期刊

Palaeobiodiversity and Palaeoenvironments BIODIVERSITY CONSERVATIONPALEONTOLOGY -PALEONTOLOGY

CiteScore

3.90

自引率

14.30%

发文量

期刊介绍： Palaeobiodiversity and Palaeoenvironments is a peer-reviewed international journal for the publication of high-quality multidisciplinary studies in the fields of palaeobiodiversity, palaeoenvironments and palaeobiogeography. Key criteria for the acceptance of manuscripts are a global scope or implications of problems on a global scale significant not only for a single discipline, a focus on the diversity of fossil organisms and the causes and processes of change in Earth’s history. The topics covered include: Systematic studies of all fossil animal / plant groups with a special focus on palaeoenvironmental investigations, palaeoecosystems and climate changes in Earth’s history, environment-organism interaction, comparison of modern and ancient sedimentary environments, palaeoecology and palaeobiogeography.