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首页> 外文期刊>Acta Palaeontologica Polonica >A small camelid Hemiauchenia from the Late Pleistocene of Hidalgo, central Mexico
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A small camelid Hemiauchenia from the Late Pleistocene of Hidalgo, central Mexico

机译：来自墨西哥中部伊达尔戈晚更新世的小型骆驼科血吸虫病

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摘要

Pleistocene camels from Mexico include representatives of llamas and camels. Their record spans from the Early Blancan to the Late Pleistocene, based on several localities in the northern, northwestern and central parts of the country, with members of the genus Hemiauchenia being particularly well represented. New specimens of a small llama, collected in the state of Hidalgo, central Mexico, are assigned to Hemiauchenia gracilis owing to a combination of cranial and postcranial characters, including a short upper premolar-molar series, the presence of a two-rooted P3, molars covered by a thin layer of cementum, U-shaped molar crescents, well-developed styles and ribs, a small degree of crenulation, a relatively short lower tooth row, the lack of p1 and p3, weakly developed anteroexternal stylids, a shallow and slender mandible, and long and slender metatarsals and phalanges. The material described here extends the Pleistocene geographic distribution of H. gracilis from northern to central Mexico, and its biochronological range from the Early Blancan to the Late Pleistocene (Rancholabrean), thus making it the southernmost record and the geochronologically youngest occurrence of this species in North America. The mesowear pattern of the material from Hidalgo suggests that these animals were mainly browsers. Their estimated body mass resembles that of Blancan specimens from Guanajuato, implying that this species maintained approximately the same body mass throughout its biochronological range in central Mexico.
机译：来自墨西哥的更新世骆驼包括美洲驼和骆驼的代表。他们的记录从布兰卡早期到更新世晚期，根据该国北部，西北部和中部的一些地区而定，其中以血友病属的成员尤为突出。由于颅骨和后颅骨特征的结合，包括短的上磨牙前磨牙系列，存在两根P3，在墨西哥中部希达尔戈州收集的新的小美洲驼标本被分配给轻度血吸虫。磨牙被牙骨质薄层覆盖，U形磨牙新月形，发达的花柱和肋骨，小程度的齿状形成，下齿排相对较短，缺乏p1和p3，前外侧外齿的发育较弱，浅而柔软下颌骨细长，long骨和趾骨又长又细长。此处描述的材料将H. gracilis的更新世地理分布从北部扩展到墨西哥中部，其生物年代学范围从早期布兰肯到晚期更新世（Rancholabrean），因此使其成为该物种的最南端记录和最短地质年代的物种。北美。 Hidalgo的材料的中观磨损模式表明，这些动物主要是浏览器。他们的估计体重类似于瓜纳华托州的布兰卡人标本，这表明该物种在墨西哥中部的整个生物年代范围内都保持大致相同的体重。

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