During the Late Neoproterozoic and Early Cambrian,a series of paleogeographic and paleoecological events occurred associated with deglaciations and the evolution of life.The appearance of fossils representing diverse ...During the Late Neoproterozoic and Early Cambrian,a series of paleogeographic and paleoecological events occurred associated with deglaciations and the evolution of life.The appearance of fossils representing diverse phyla,novel body plans and complex ecologies in Ediacaran and Cambrian sedimentary successions has sparked diverse hypotheses about potential drivers for the radiation of early animals during this interval.Recently,new macroscopic fossils of carbonaceous compressions with unique features have been found in Anning,Yunnan,China.The fossils’bodies are ribbon-shaped and bilaterally symmetric,with dense longitudinal features and transversal features.The fossils occur 0.68 m below a bentonite interlayer which has been dated 535.2±1.7 Ma by Ri-xiang Zhu and his team in 2009.The relatively simply morphology of these fossils,coupled with a lack of preserved internal structures challenge efforts taxonomically identify the precursor organism and definitively ally it to a living group.However,the symmetry and unusual features of the body are analogous to members of Platyzoa.The presence of ribbon-shaped fossils in the Zhongyicun Member in Anning indicates that these organisms were at least a locally significant component of Cambrian seafloor ecosystems,and may hold important implications for our understanding of the early evolution of Bilateria.展开更多
Two new turbellarian species, Gieysztoria shantouensis Zhang, Li ＆ Wang, sp. nov. and G. huizhouensis Zhang, Wu ＆ Wang, sp. nov. are described, which were collected from ditches in Shantou and Dongjiang River, Huizh...Two new turbellarian species, Gieysztoria shantouensis Zhang, Li ＆ Wang, sp. nov. and G. huizhouensis Zhang, Wu ＆ Wang, sp. nov. are described, which were collected from ditches in Shantou and Dongjiang River, Huizhou of Guangdong Province, respectively. G. macrovariata（Weise, 1942） was firstly recorded in China. All specimens examined were deposited in National Zoological Museum, Institute of Zoology, Chinese Academy of Sciences, China.展开更多
基金The authors thank the China Geological Survey(DD20190008)the National Natural Science Foundation of China(41574024,41662003)programmes for supporting the project.
文摘During the Late Neoproterozoic and Early Cambrian,a series of paleogeographic and paleoecological events occurred associated with deglaciations and the evolution of life.The appearance of fossils representing diverse phyla,novel body plans and complex ecologies in Ediacaran and Cambrian sedimentary successions has sparked diverse hypotheses about potential drivers for the radiation of early animals during this interval.Recently,new macroscopic fossils of carbonaceous compressions with unique features have been found in Anning,Yunnan,China.The fossils’bodies are ribbon-shaped and bilaterally symmetric,with dense longitudinal features and transversal features.The fossils occur 0.68 m below a bentonite interlayer which has been dated 535.2±1.7 Ma by Ri-xiang Zhu and his team in 2009.The relatively simply morphology of these fossils,coupled with a lack of preserved internal structures challenge efforts taxonomically identify the precursor organism and definitively ally it to a living group.However,the symmetry and unusual features of the body are analogous to members of Platyzoa.The presence of ribbon-shaped fossils in the Zhongyicun Member in Anning indicates that these organisms were at least a locally significant component of Cambrian seafloor ecosystems,and may hold important implications for our understanding of the early evolution of Bilateria.
基金supported by University Student Innovation Project of Guangdong Province,China(201410-590032)the Youth Innovation Fund of China:Xiaoping Technological Innovation Team Project,Scientific and Technological Planning Project of Shenzhen,China(CXB201104210005A)
文摘Two new turbellarian species, Gieysztoria shantouensis Zhang, Li ＆ Wang, sp. nov. and G. huizhouensis Zhang, Wu ＆ Wang, sp. nov. are described, which were collected from ditches in Shantou and Dongjiang River, Huizhou of Guangdong Province, respectively. G. macrovariata（Weise, 1942） was firstly recorded in China. All specimens examined were deposited in National Zoological Museum, Institute of Zoology, Chinese Academy of Sciences, China.
