The northernmost sauropod record in the Northern Hemisphere
The northernmost sauropod record in the Northern Hemisphere
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DOI：
10.1111/let.12362
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发表时间：
2019-11-27
期刊：
影响因子：
1.5
通讯作者：
Martin, Thomas
中科院分区：
文献类型：
--
作者：
Averianov, Alexander O.;Skutschas, Pavel P.;Martin, Thomas
在雅库特（俄罗斯东西伯利亚）早白垩世提特地区发现的孤立蜥脚类恐龙牙齿是蜥脚类恐龙生活在北方半球高纬度地区（古纬度估计为北纬62度）的唯一证据。成年个体的匙形宽齿冠缺乏边缘密齿，而这些存在于幼年牙齿中。牙齿有重叠的小面，可能属于基底巨齿动物。幼年的牙齿表明蜥脚类恐龙在高纬度地区繁殖，并可能全年都呆在那里。泰脊椎动物组合包括吸热或推测为吸热的四足动物（兽脚类恐龙、三尖齿兽和哺乳动物）和变温四足动物（蝾螈、海龟、离足类和蜥蜴），但没有鳄形类。这表明气候温和，年平均气温远高于冰点，但低于14摄氏度。
Isolated sauropod teeth from the Early Cretaceous Teete locality in Yakutia (Eastern Siberia, Russia) are the only evidence that sauropods lived in high latitudes (palaeolatitude estimate of N 62 degrees) in the Northern Hemisphere. The spatulate broad tooth crowns of adult individuals lack marginal denticles while these are present in a juvenile tooth. The teeth have overlapping facets and likely belong to a basal macronarian. The juvenile tooth indicates that sauropods reproduced in high latitudes and possibly stayed there around the year. The Teete vertebrate assemblage comprises both endothermic, or presumably endothermic tetrapods (theropod dinosaurs, tritylodontids and mammals), and ectothermic tetrapods (salamanders, turtles, choristoderes and lizards), but no crocodyliforms. This suggests a temperate climate, with an annual mean temperature well above freezing level but below 14 degrees C.