首页> 外文期刊>Micropaleontology >Phyletic trends in uppermost Triassic (Rhaetian) Radiolaria: Two examples from Queen Charlotte Islands, British Columbia, Canada
【24h】

Phyletic trends in uppermost Triassic (Rhaetian) Radiolaria: Two examples from Queen Charlotte Islands, British Columbia, Canada

机译:最上层的三叠纪(Rhaetian)放射虫的形态变化趋势:来自加拿大不列颠哥伦比亚省夏洛特皇后群岛的两个例子

获取原文
获取原文并翻译 | 示例
       

摘要

Risella Carter and Laxtorum Blome, two genera from the diverse Rhaetian fauna of the Sandilands formation, Queen Charlotte Islands, are used to illustrate phyletic trends in latest Triassic Radiolaria. Several distinct morphotypes constituting alineage Are recognized for each genus. These lineages are homogenous, evolved in situ, and show a continuum of variation through time. The Evolution of Risella takes place entirely in the Rhaetian and all species disappear at the end of the Triassic. Earliest species of Laxtorum Appear in the upper Norian and evolve rapidly in the Rhaetian. All Rhaetian species go extinct at the end of the Triassic but the genus Survives marginally into the Lower Jurassic.
机译:Risella Carter和Laxtorum Blome是夏洛特皇后群岛桑迪兰群岛形成的各种Rhaetian动物区系的两个属,用于说明最新的三叠纪放射虫的系统发育趋势。每个属均识别出构成世系的几种不同形态。这些血统是同质的,在原位进化,并显示出随时间变化的连续性。 Risella的进化完全发生在Rhaetian中,所有物种在三叠纪末期消失。最早的Laxtorum物种出现在Norian上层,并在Rhaetian迅速演化。在三叠纪末期,所有的Rhaetian物种都灭绝了,但该物种仅存活到下侏罗纪。

著录项

相似文献

  • 外文文献
获取原文

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