2023年5月10日，CURRENT BIOLOGY杂志在线刊登了云南师范大学李昱静博士在发表最新研究成果《

Cambrian stem-group ambulacrarians and the nature of the ancestral deuterostome》。

文献来源：https://doi.org/10.1016/j.cub.2023.04.048

Yujing Li 1 2 3, Frances S. Dunn 4, Duncan J.E. Murdock 4, Jin Guo 2 5, Imran A. Rahman 4 6 7, Peiyun Cong 2

• 1Yunnan Normal University, Kunming 650500, China

• 2Yunnan Key Laboratory for Palaeobiology & MEC International Joint Laboratory for Palaeobiology and Palaeoenvironment, Institute of Palaeontology, Yunnan University, Kunming 650500, China

• 3State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China

• 4Oxford University Museum of Natural History, University of Oxford, Oxford OX1 3PW, UK

• 5Management Committee of the Chengjiang Fossil Site World Heritage, Chengjiang 652599, China

• 6.The Natural History Museum, London SW7 5BD, UK

Highlights

• •Exceptionally preserved fossils of the discoidal animal Rotadiscus are described

• •Rotadiscus exhibits a combination of ambulacrarian and chordate characters

• •Phylogenetic analyses recover Rotadiscus as a stem ambulacrarian

• •Major deuterostome characters evolved through convergence

  
  

Summary

Deuterostomes are characterized by some of the most widely divergent body plans in the animal kingdom. These striking morphological differences have hindered efforts to predict ancestral characters, with the origin and earliest evolution of the group remaining ambiguous. Several iconic Cambrian fossils have been suggested to be early deuterostomes and hence could help elucidate ancestral character states. However, their phylogenetic relationships are controversial. Here, we describe new, exceptionally preserved specimens of the discoidal metazoan Rotadiscus grandis from the early Cambrian Chengjiang biota of China. These reveal a previously unknown double spiral structure, which we interpret as a chordate-like covering to a coelomopore, located adjacent to a horseshoe-shaped tentacle complex. The tentacles differ in key aspects from those seen in lophophorates and are instead more similar to the tentacular systems of extant pterobranchs and echinoderms. Thus, Rotadiscus exhibits a chimeric combination of ambulacrarian and chordate characters. Phylogenetic analyses recover Rotadiscus and closely related fossil taxa as stem ambulacrarians, filling a significant morphological gap in the deuterostome tree of life. These results allow us to reconstruct the ancestral body plans of major clades of deuterostomes, revealing that key traits of extant forms, such as a post-anal region, gill bars, and a U-shaped gut, evolved through convergence.

李昱静博士基本情况介绍：

李昱静，女，汉族，1987年4月出生于黑龙江大庆，博士后，助理研究员，2022年7月入职云南师范大学，现为云南师范大学教师。

邮箱E-mail: yujingli@ynu.edu.cn

学历 Education

2005.9 - 2009.6 中国地质大学（武汉），英语 学士

2010.9 - 2013.6 云南大学，古生物学与地层学 硕士 （导师：侯先光）

2013.9 - 2018.6 云南大学，进化生物学 博士（导师：侯先光）

2015.10 - 2017.10 英国莱斯特大学，古生物学 联合培养博士（导师：Mark Williams）

职历 Appointments

2009.9 - 2010.6 四川省汉源县乌斯河中学，支教（大学生志愿服务西部计划）

2018.10 - 至今 云南大学生态学博士后科研流动站，博士后（合作导师：丛培允）

研究兴趣 Research Interests

澄江生物群为代表的寒武纪特异埋藏化石库中的后口动物化石形态学、系统学及个体生态学

论文 Publications

Yujing Li*, Mark Williams, Thomas H. P. Harvey, Fan Wei, Yang Zhao, Jin Guo, Sarah Gabbott, Tom Fletcher, Xianguang Hou & Peiyun Cong*, 2020. Symbiotic fouling of Vetulicola, an early Cambrian nektonic animal. Communications Biology 3, 517.

Jun Zhao, Yujing Li*, Paul A. Selden & Peiyun Cong, 2020. New occurrence of the Guanshan Lagerstätte (Cambrian Series 2, Stage 4) in the Kunming area, Yunnan, southwest China, with records of new taxa. Alcheringa: An Australasian Journal of Palaeontology 44:3, 343-355.

Yujing Li, Mark Williams, Sarah E. Gabbott*, Ailin Chen, Peiyun Cong & Xianguang Hou*, 2018. The enigmatic metazoan Yuyuanozoon magnificissimi from the early Cambrian Chengjiang Biota, Yunnan Province, South China. Journal of Paleontology 92(6): 1081-1091.

Yujing Li, Peiyun Cong, Jun Zhao & Xianguang Hou*, 2015. New observations on morphological variation of Genus Vetulicola with quadrate carapace from the Cambrian Chengjiang and Guanshan biotas, South China. Palaeoworld 24(1-2): 36–45.

参考来源：

http://www.ynuip.ynu.edu.cn/info/1023/1262.htm

https://rsc.ynnu.edu.cn/info/1007/2020.htm