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New ecdysozoan fossil embryos from the basal Cambrian of China

文献类型：期刊论文

作者Liu, Mingjin1; Xian, Xiaofeng2; Zhang, Huaqiao2; Eriksson, Mats E.3; Liu, Yunhuan1; Shao, Tiequan1
刊名PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
出版日期2025-02-01
卷号659页码:12
关键词Fossil embryo Ecdysozoa Orsten-type fossils Kuanchuanpu formation Zhangjiagou section Cambrian Fortunian
ISSN号0031-0182
DOI10.1016/j.palaeo.2024.112635
通讯作者Zhang, Huaqiao(hqzhang@nigpas.ac.cn) ; Liu, Yunhuan(yunhuanl@chd.edu.cn)
英文摘要Invertebrate embryos have relatively low fossilization potential; however, when preserved, they can offer crucial insights into the evolutionary developmental biology of extinct animals. Here we report new exceptionally preserved fossil embryos from the early Fortunian (early Cambrian) of China, which are assigned to two new taxa, Saccus xixiangensis gen. et sp. nov. and Saccus necopinus gen. et sp. nov. All specimens are three- dimensionally phosphatized, akin to the Orsten-type preservation. The embryos are enclosed within a thin and smooth envelope ranging in diameter from 730 mu m to 1 mm. The embryos have a bag-shaped body, a non- ciliated integument, radially arranged sclerites apically, and bilaterally arranged sclerites abapically, but lack any orifice, thus representing a developmental stage prior to the formation of a mouth or anus. The integument shows soft deformation, while the sclerites remain largely undeformed, suggesting that the sclerites are stiffer and likely cuticularized. The arrangement of the abapical sclerites imparts bilaterality, classifying these new embryos as bilaterians. Furthermore, the absence of cilia or cilium insertion sites and the presence of cuticularized sclerites suggest an ecdysozoan affinity. The relatively large embryo size indicates yolk-rich eggs, and the presence of cuticle implies that the embryos are in later embryonic stages, possibly close to hatching. In the absence of hatched specimens, it is inferred that these embryos undergo indirect development, hatching as lecithotrophic (yolk-feeding) larvae. In this case, the morphology of the juvenile and adult forms is uncertain due to metamorphosis during later growth. Alternatively, the embryos could undergo direct development, hatching as lecithotrophic juveniles, with both juveniles and adults potentially having a similar bag-shaped body without an introvert or paired limbs, closely reminiscent of Saccorhytus. This study expands our understanding of the morphological disparity and diversity of early Fortunian fossil embryos and ecdysozoans.
WOS关键词ANIMAL EMBRYOS ; EVOLUTION ; MIDDLE ; CYCLONEURALIANS ; ZHANGJIAGOU ; TAPHONOMY ; RECORD ; LARVAE ; MOLT
资助项目National Natural Science Foundation of China[42172020] ; National Natural Science Foundation of China[41921002] ; National Key Research and Development Program of China[2022YFF0802700] ; Swedish Research Council[2019-03516]
WOS研究方向Physical Geography ; Geology ; Paleontology
语种英语
WOS记录号WOS:001383374800001
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Key Research and Development Program of China ; Swedish Research Council
源URL[http://ir.nigpas.ac.cn/handle/332004/44724]  
专题中国科学院南京地质古生物研究所
通讯作者Zhang, Huaqiao; Liu, Yunhuan
作者单位1.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
3.Lund Univ, Dept Geol, Solvegatan 12, SE-22362 Lund, Sweden
推荐引用方式
GB/T 7714		 Liu, Mingjin,Xian, Xiaofeng,Zhang, Huaqiao,et al. New ecdysozoan fossil embryos from the basal Cambrian of China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2025,659:12.
APA Liu, Mingjin,Xian, Xiaofeng,Zhang, Huaqiao,Eriksson, Mats E.,Liu, Yunhuan,&Shao, Tiequan.(2025).New ecdysozoan fossil embryos from the basal Cambrian of China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,659,12.
MLA Liu, Mingjin,et al."New ecdysozoan fossil embryos from the basal Cambrian of China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 659(2025):12.

入库方式： OAI收割

来源：南京地质古生物研究所

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