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Species discrimination in Carcharhinus shark teeth using elliptic Fourier analysis.

机译：使用椭圆傅里叶分析的真鲨属鲨鱼牙齿中的物种识别。

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摘要

Sharks of the genus Carcharhinus are commonly represented in fossil assemblages by isolated teeth. Neogene fossil teeth from this genus have been identified by many authors as belonging to extant species. Their association with specific modern or extinct species is particularly challenging due to similarities in tooth shape among species. This study tests the ability of elliptic Fourier analysis (EFA) and discriminant function analysis (DFA) to identify the upper teeth of twelve modern species in this genus which have been independently identified using standard morphological characters and dental formulae. Teeth were extracted from three jaws for each of the fourteen species. After extraction from the jaw, EFA was performed on the digitized images, transforming the outline into a series of elliptic Fourier coefficients. These coefficients were then subjected to principal components analysis, and DFA was performed on the principal component values. Test and training set results demonstrate the discriminatory ability of this method, with over 55% of teeth being correctly identified to species. Anterior and posterior tooth positions were more likely to be misidentified. Also, teeth that were misidentified were commonly assigned to other species with similar tooth morphologies. The practical paleontological applications of this morphometric method include species identification and the construction of artificial dentitions using isolated fossil teeth.
机译：鲨鱼属的鲨鱼通常以孤立的牙齿出现在化石组合中。许多作者已经鉴定出该属的新近系化石牙齿属于现存物种。由于物种之间牙齿形状的相似性，它们与特定的现代或灭绝物种的关联特别具有挑战性。这项研究测试了椭圆傅里叶分析（EFA）和判别函数分析（DFA）识别该属中十二种现代物种的上部牙齿的能力，这些物种已使用标准形态学特征和牙科配方独立鉴定。从这14个物种的三个颚中提取出牙齿。从颌骨提取后，对数字化图像执行EFA，将轮廓转换为一系列椭圆傅里叶系数。然后对这些系数进行主成分分析，并对主成分值执行DFA。测试和培训结果证明了该方法的辨别能力，其中超过55％的牙齿被正确地识别为物种。前牙和后牙的位置更有可能被误认。同样，被误识别的牙齿通常被分配给具有相似牙齿形态的其他物种。这种形态计量学方法的实际古生物学应用包括物种鉴定和使用孤立的化石齿构造人工牙列。

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  • 作者

    Smith, Vann.;

  • 作者单位

    Tulane University School of Science and Engineering.;

  • 授予单位 Tulane University School of Science and Engineering.;
  • 学科 Paleontology.;Geology.;Zoology.
  • 学位 M.S.
  • 年度 2015
  • 页码 87 p.
  • 总页数 87
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 物理化学（理论化学）、化学物理学;
  • 关键词

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