This work was supported by the National Natural Science Foundation of China(42130206,4227200,41890845,and 41621003);the Key Project of the State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences(SKLLQGZR2206);the Programme of Introducing Talents of Discipline to Universities(the“111”Project);the Key Scientific and Technological Innovation Team Project in Shaanxi Province;the Ministry of Education of China for Changjiang Scholars to Jianni Liu.
As typical non-biomineralized arthropods from Series 2 and the Miaolingian of the Cambrian,nektaspids are widely distributed and well-studied[1–3].It is generally accepted that the three families(Naraoiidae,Emucaridi...