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°) 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°C.

中文翻译：

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北半球最北端的蜥脚类动物记录

来自雅库特（俄罗斯西伯利亚东部）白垩纪早期Teete地方的孤立蜥脚类动物牙齿是蜥脚类动物生活在北半球高纬度地区（古纬度估计为N 62°）的唯一证据。成年个体的有齿的阔齿冠缺乏边缘齿，而它们存在于幼齿中。牙齿的小面重叠，很可能属于基底巨猿。幼齿表明蜥脚类动物在高纬度地区繁殖，并可能在一年中停留在那里。Teete脊椎动物组合既包括吸热的或大概是吸热的四足动物（兽脚类恐龙，三齿龙和哺乳动物），也包括吸热的四足动物（水蜥蜴，乌龟，蛇足兽和蜥蜴），但没有鳄形。这表明气候温和，