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社评“xxx100hd日本”-环球时报

云南麒麟:发现xxx100hd日本2.7亿年前的瓣齿鲨牙齿化石

来源: 海峡导报
2024-11-13 03:34:59

最佳回答

“xxx100hd日本”云南麒麟:发现xxx100hd日本2.7亿年前的瓣齿鲨牙齿化石

  中新xxx100hd日本网曲靖11月12日电(xxx100hd日本包建新) 12日,中国科学院古脊椎动物与古人类研究所研究员盖志琨介绍,经其鉴定,古生物科普爱好者日前在云南省曲靖市麒麟区东面山发现的一块化石,为距今2.7亿年前二叠纪地层瓣齿鲨牙齿化石。

  曲靖市地处云贵高原中部的乌蒙山脉,麒麟区为该市市府所在地。

图为盖志琨(左二)在曲靖鉴定瓣齿鲨牙齿化石。师伯良 摄

  “这块牙齿化石与苔藓虫类、腕足类、海百合类等海洋生物化石富集一起,表明曲靖地区晚石炭世至早二叠世多次受到海侵事件影响,导致沉积的多次中断,使得该地区形成多次灰岩—砂岩—煤层的交替沉积,这一现象也见证了西南板块古生代晚期的多次沧海桑田。”盖志琨介绍,此前,欧洲和美洲均发现过瓣齿鲨化石;2021年,中国首次报道在山西阳泉发现瓣齿鲨牙齿化石。

  盖志琨介绍,根据目前发现的瓣齿鲨鱼牙化石推算,多数瓣齿鲨鱼的体长为3-5米。曲靖发现的瓣齿鲨鱼牙齿化石较大,初步推测该瓣齿鲨体长近6米,是目前已知体型较大的一种。

图为曲靖发现的瓣齿鲨牙齿化石。师伯良 摄

  盖志琨称,瓣齿鲨是一种十分神秘且原始的软骨鱼类,主要生活在距今约3.6亿年至2.5亿年之间,在分类上属于软骨鱼类中的真软骨头类。

  据悉,曲靖发现瓣齿鲨化石,大大扩展了瓣齿鲨类在北半球的古地理分布范围,进一步揭示了瓣齿鲨极可能是一类善于游泳扩散的远洋鱼类,对研究中国西南地区二叠纪海洋生物多样性与分析指示古环境有着重要意义。(完)

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