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首页> 外文期刊>Journal of Paleontology >Statistical analysis of dental variation in the Oligocene equid Miohippus (Mammalia, Perissodactyla) of Oregon
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Statistical analysis of dental variation in the Oligocene equid Miohippus (Mammalia, Perissodactyla) of Oregon

机译：俄勒冈州寡核苷酸肺癌（Mammalia，Perissodartyla）牙科变异的统计分析

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As many as eight species of the anchitherine equid Miohippus have been identified from the John Day Formation of Oregon, but no statistical analysis of variation in these horses has yet been conducted to determine if that level of diversity is warranted. Variation of the anterior-posterior length and transverse width of upper and lower teeth of Turtle Cove Member Miohippus was compared to that of M. equinanus, Mesohippus bairdii, Equus quagga, and Tapirus terrestris using t tests of their coefficients of variation (V). None of the t tests are significant, indicating that the variation seen in Turtle Cove Miohippus is not significantly different from any of the populations of other perissodactyls examined in this study. Data also indicate that Mesohippus is present in the Turtle Cove Member. Additionally, hypostyle condition, used to diagnose all species of Miohippus, was found to be related to stage of wear using an ordered logistic regression. Only two species of equid, one Miohippus and one Mesohippus, in the Turtle Cove Member can be identified, therefore only Miohippus annectens, the genotype and first species described from the region, can be recognized as the sole Miohippus species known from the Turtle Cove assemblage. There are insufficient data to determine which species of Mesohippus is present. The dependence of hypostyle condition on crown height in Miohippus implies that wear stage must also be considered in investigations of dental morphology in the Anchitheriinae.
机译：已经确定了多达八种勤参，俄勒冈州约翰日地层识别，但尚未进行这些马的变异统计分析，以确定是否有必要进行多样性。将龟湾成员Miohippus的上下牙齿和下牙的前后长度和横向宽度的变化与M. Equinanus，Mesohouchbus Bairdii，Equus Quagga和Tapirus Terress的横齿的横向和下齿进行了比较。 T型测试都不是显着的，表明在龟湾Miohippus中看到的变异与本研究中检测的其他胰岛细胞的任何群体没有显着差异。数据还表明，龟湾成员中的中间熟料存在。另外，用于诊断所有物种的封闭式条件，发现使用有序的逻辑回归与磨损阶段有关。只能识别出在龟湾成员中只有两种等同，一个miohippus和一个中间熟料，因此只能识别来自该地区的Miohippus alnectens，基因型和第一个物种，可以被认为是从龟湾组合中熟知的唯一Miohippus物种。没有足够的数据来确定存在哪些Mesohippus。在Miohippus中冠状高度的抑制条件的依赖意味着还必须考虑在锚艾因牙科形态的研究中考虑磨损阶段。

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