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“xxxxx96”-知识课堂

中外联合团队发现xxxxx96奥陶纪大附肢节肢动物新属种

来源: 环球网
2024-11-01 20:33:41

最佳回答

“xxxxx96”中外联合团队发现xxxxx96奥陶纪大附肢节肢动物新属种

  中新xxxxx96网昆明10月30日电 (记者xxxxx96 胡远航)记者30日从云南大学获悉,该院刘煜团队与英国牛津大学、美国耶鲁大学和美国加利福尼亚大学伯克利分校的科研人员合作,从产自美国纽约州奥陶纪比彻三叶虫层生物群的新物种化石中,发现了奥陶纪首个林乔利科新属种Lomankus edgecombei及其完整的三维精细软体结构。相关研究成果于日前发表在国际著名学术期刊《当代生物学》。

图为Lomankus edgecombei的光学照片。云南大学 供图

  据介绍,该研究通过使用云南大学古生物研究院的显微CT设备对产自美国纽约州的奥陶纪比彻三叶虫层生物群的新物种化石进行高精度扫描,并使用计算机三维重建及虚拟解剖技术,报道了奥陶纪首个林乔利科新属种Lomankus edgecombei。

  系统发育分析表明,Lomankus edgecombei与林乔利属物种为姐妹群,且位于分支末端。

图为基于CT扫描的Lomankus edgecombei三维建模及虚拟解剖图。云南大学 供图

  研究还表明,该物种体长在8-20毫米之间。与其他林乔利科的物种相比,其大附肢远端肢节大幅缩小,细长的鞭节直接连接到肢节上,表明其功能是感知而非猎食;尾部前端为倒三角形,后端为长度大于动物体长的尾刺。在头甲之下保存有发育良好的口板区域。

  Lomankus edgecombei的发现表明,寒武纪时期的优势物种——林乔利节肢动物在奥陶纪幸存下来,其大附肢从捕食功能转变为感官功能以及眼睛证据的缺失等形态特征变化,很可能该新种曾占据了底栖的生态位。这一研究也从一定程度反映了寒武纪顶端食肉动物的演化过程,为研究早期节肢动物演化提供了新的证据和理论支撑。(完)

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