Turk Katherine A, Pulsipher Mikaela A, Mocke Helke, Laflamme Marc, Darroch Simon A F
Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, TN, USA.
Evolutionary Studies Institute, Vanderbilt University, Nashville, TN, USA.
R Soc Open Sci. 2024 Oct 16;11(10):240452. doi: 10.1098/rsos.240452. eCollection 2024 Oct.
igen. et isp. nov., a new trace fossil from the late Ediacaran Huns Member of the Urusis Formation, southern Namibia, comprises intertwining tubes exhibiting dual lineation patterns and reminiscent of both modern and early Cambrian examples of priapulid worm burrows. These similarities support the interpretation of a total-group scalidophoran tracemaker for , thus providing direct evidence for the first appearance date of Scalidophora in the late Ediacaran 539 Ma. This new material is thus indicative of the presence of total-group scalidophorans below the Cambrian boundary and supports inference of a lengthy Precambrian fuse for the Cambrian explosion.
igen. et isp. nov.（一种新的遗迹化石），来自纳米比亚南部乌鲁西斯组晚埃迪卡拉纪洪斯段，由相互缠绕的管道组成，呈现出双重线性模式，让人联想到现代和寒武纪早期鳃曳虫类蠕虫洞穴的例子。这些相似之处支持了将其解释为由全类鳃曳动物形成的痕迹制造者，从而为鳃曳动物门在埃迪卡拉纪晚期（5.39亿年前）的首次出现日期提供了直接证据。因此，这种新材料表明在寒武纪边界之下存在全类鳃曳动物，并支持了寒武纪大爆发有漫长前寒武纪准备阶段的推断。
