作者:Qiang Ou & Georg Mayer 来源:Scientific Reports 发布时间:2018/9/30 9:26:43
选择字号:
发现寒武纪“隐居者”蠕虫化石

论文标题:A Cambrian unarmoured lobopodian, †Lenisambulatrix humboldti gen. et sp. nov., compared with new material of †Diania cactiformis

期刊:Scientific Reports

作者:Qiang Ou & Georg Mayer

发表时间:2018/09/20

数字识别码:10.1038/s41598-018-31499-y

原文链接:https://www.nature.com/articles/s41598-018-31499-y?utm_source=Other_website&utm_medium=Website_links&utm_content=RenLi-MixedBrand-multijournal-Multidisciplinary-China&utm_campaign=ORG_USG_JRCN_RL_article_promotion_sciencenet_Sep_4th

微信链接:https://mp.weixin.qq.com/s/JIU6UhxEkJjlrr2l9_74hg

《科学报告》近日发表的一项研究A Cambrian unarmoured lobopodian, †Lenisambulatrix humboldti gen. et sp. nov., compared with new material of †Diania cactiformis描述了寒武纪(5.41-4.85亿年前)叶足动物的一个新物种——一种具有柔软附肢的蠕虫状动物。

中国地质大学(北京)的欧强和德国卡塞尔大学的Georg Mayer将这个命名为Lenisambulatrix humboldti的新物种与之前描述过的叶足动物仙掌滇虫(Diania cactiformis)进行比较,发现了一些新细节。

图1:Lenisambulatrix humboldti的三维重建模型。图源:Ou & Mayer

作者指出,两种叶足动物的身形和躯体分节都很相似,都有较厚较长的附肢(叶足),长度约为11.6-18mm。与其它叶足动物不同的是,两个物种似乎都无爪。不过,仙掌滇虫的躯干表面布满刺状铠甲,故其绰号为“行走的仙人掌”,但L. humboldti的整个躯体似乎并无盔甲。

图2:Lenisambulatrix humboldti 的正模标本。图源:Ou & Mayer

根据作者描述,新物种的躯体有分节、呈管状,与蠕虫类似,且每个体节都有一对附肢。新物种躯体只有一端得以保存,且并未发现如眼睛、嘴巴或触须这些可以确定此端为头部的显著特征。相比之下,假定为仙掌滇虫头部的部位则具有明显的类似头盔的结构。

图3:叶足动物仙掌滇虫的细节图。图源:Ou & Mayer

从两个物种的形态特征可以大致判断出它们曾经可能的生活方式。因为两者都是海洋栖息动物,它们的无爪附肢可能是为了适应在柔软的海底行走或爬行。仙掌滇虫的厚重铠甲可能有助于防御捕食者的攻击,而L. humboldti的躯体较柔软,或表明其个体曾过着隐居生活,藏于缝隙或海绵群体中以抵御被捕食的风险。

摘要:Cambrian marine lobopodians are generally considered as predecessors of modern panarthropods (onychophorans, tardigrades, and arthropods). Hence, further study of their morphological diversity and early radiation may enhance our understanding of the ground pattern and evolutionary history of panarthropods. Here, we report a rare lobopodian species, †Lenisambulatrix humboldti gen. et sp. nov. (“Humboldt lobopodian”), from the early Cambrian Chengjiang Lagerstätte and describe new morphological features of †Diania cactiformis, a coeval armoured lobopodian nicknamed “walking cactus”. Both lobopodian species were similar in possessing rather thick, elongate lobopods without terminal claws. However, in contrast to †Diania cactiformis, the body of which was heavily armored with spines, the trunk and limbs of the Humboldt lobopodian were entirely unarmored. Our study augments the morphological diversity of Cambrian lobopodians and presents two evolutionary extremes of cuticular ornamentation: one represented by the Humboldt lobopodian, which was most likely entirely “naked”, the other epitomized by †D. cactiformis, which was highly “armoured”.

阅读论文全文请访问:https://www.nature.com/articles/s41598-018-31499-y?utm_source=Other_website&utm_medium=Website_links&utm_content=RenLi-MixedBrand-multijournal-Multidisciplinary-China&utm_campaign=ORG_USG_JRCN_RL_article_promotion_sciencenet_Sep_4th

期刊介绍:Scientific Reports (https://www.nature.com/srep/) is an online, open access journal from the publishers of Nature. We publish scientifically valid primary research from all areas of the natural and clinical sciences.

The 2017 journal metrics for Scientific Reports are as follows:

•2-year impact factor: 4.122

•5-year impact factor: 4.609

•Immediacy index: 0.576

•Eigenfactor® score: 0.71896

•Article Influence Score: 1.356

•2-year Median: 2

(来源:科学网)

 
 
 
特别声明:本文转载仅仅是出于传播信息的需要,并不意味着代表本网站观点或证实其内容的真实性;如其他媒体、网站或个人从本网站转载使用,须保留本网站注明的“来源”,并自负版权等法律责任;作者如果不希望被转载或者联系转载稿费等事宜,请与我们接洽。
 
 打印  发E-mail给: 
    
 
以下评论只代表网友个人观点,不代表科学网观点。

 
相关新闻 相关论文

图片新闻
“零饥饿”目标面临“隐性”挑战 治病救人的大科学装置,中国有了
全球首架大集成航空物探遥感调查机亮相 机构改革后,如何保护“保护地”
>>更多
 
一周新闻排行 一周新闻评论排行
 
编辑部推荐博文
 
论坛推荐