• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >The function, histology and classification of selected prioniodontid conodonts
【2h】

The function, histology and classification of selected prioniodontid conodonts

机译：所选齿尖齿牙形齿的功能，组织学和分类

页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The prioniodontids were the first to develop a functionally differentiated apparatus. The apparatuses of selected prioniodontid taxa are reconstructed by direct comparisons between elements from disjunct collections and those preserved in natural assemblages of Promissum pulchrum. These comparisons and evidence of internal morphology have enabled the recognition of homologous elements.;Examination of prioniodontid hard tissues has provided a clearer understanding of conodont hard tissues. Polished sections have provided evidence of intergradation between white matter and hyaline tissues confirming their synchronous deposition. Also surface ornamentation is shown to be directly related to internal structure.;Apparatus reconstructions and studies of internal and external wear patterns also reveal new evidence for element function. Elements occluded in a way broadly comparable to those of the ozarkodinid elements (Donoghue and Purnell, 1999a), though interlocking occlusion only occurs in association with a well formed blade. Where a blade is not developed, elements simply worked against each other, wearing down the oral surfaces.;Phragmodus inflexus represents the second prioniodontid apparatus preserved as a natural assemblage and its architecture, presented here, differs markedly from that of Promissum. This has important implications for prioniodontid apparatus architecture, as the elements of Phragmodus are comparable to those typical of many prioniodontids not included with the balognathids. This may suggest that apparatuses of most prioniodontids had an ozarkodinid-like apparatus and that Promissum possesses a more derived plan.;This new evidence is important for understanding phylogenetic relationships between prioniodontids. Realistic cladistic studies should be based on clearly understood homologous characters and it is hoped that in the future, cladistic analyses will draw from detailed data, such as those presented here.
机译：prioniodontids是第一个开发功能分化仪器的人。通过直接比较分离集合中的元素和自然花香组织中保存的元素之间的比较，可以重建所选的齿齿类生物群的设备。这些比较和内部形态的证据使人们能够识别同源元件。对单齿齿硬组织的检查提供了对齿形硬组织的更清晰的理解。抛光的切片提供了白质和透明组织之间的相互融合的证据，证实了它们的同步沉积。还表明表面装饰与内部结构直接相关。设备的重建以及内部和外部磨损模式的研究也揭示了元素功能的新证据。尽管互锁闭塞仅与形成良好的叶片有关，但它们的闭塞方式与厄扎克丁类元素的闭塞方式大致相当（Donoghue和Purnell，1999a）。在未开发刀片的情况下，元件只是互相作用，磨损了口腔表面。Ph草代表第二种以自然组合保存的齿齿科器械，其结构与此处的Promissum明显不同。这对单齿类牙齿装置结构具有重要的意义，因为芦苇的元素可与许多不包括在假牙根类动物​​中的单齿类牙齿的特征相媲美。这可能表明大多数的正齿类齿虫的器皿都具有类似ozarkodinid的装置，而普罗蓬菌具有更为衍生的计划。现实的分类研究应基于清楚理解的同源特征，并希望将来，分类分析将从详细数据（例如此处提供的数据）中提取。

著录项

  • 作者

    Barrett, Stephanie.;

  • 作者单位
  • 年度 2000
  • 总页数
  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
  • 中图分类

相似文献

  • 外文文献
  • 中文文献
  • 专利

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号