Article
Multidisciplinary Sciences
Shengguang Chen, Xinglian Yang, Xiong Liu, Zhengpeng Chen, Zhixin Sun, Fangchen Zhao
Summary: This study investigates the moult configurations of Oryctocephalus indicus and provides new materials for studying moulting behaviour in oryctocephalid trilobites. The findings are important for understanding the moulting behavior of trilobites.
Article
Geosciences, Multidisciplinary
Zhiliang Zhang, Mansoureh Ghobadi Pour, Leonid E. Popov, Lars E. Holmer, Feiyang Chen, Yanlong Chen, Glenn A. Brock, Zhifei Zhang
Summary: This study in South China reveals the oldest Cambrian brachiopod-trilobite association, providing potential for stratigraphic correlation. The new species Eoobolus incipiens represents one of the earliest linguliform brachiopods.
Article
Geography, Physical
Shu-han Zhang, Jun-xuan Fan, Chad A. Morgan, Charles M. Henderson, Shu-zhong Shen
Summary: This study examines the trilobite diversity pattern in the middle-late Cambrian of South China, constructing a high time-resolution species-level richness curve and identifying distinct changes in species diversity at different stages, as well as exploring trilobite evolutionary mechanisms associated with environmental changes and biotic competition.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Multidisciplinary Sciences
Ruiwen Zong
Summary: An injured specimen of Shergoldia laevigata was collected from the Furongian of Guangxi, South China, showing substantial transverse shortening of the left pleural segments and barely perceptible traces of healing. The injuries are interpreted as a sub-lethal attack from an unknown predator, potentially affecting the trilobite's molting process.
Article
Biology
James D. Holmes, John R. Paterson, Diego C. Garcia-Bellido
Summary: Analyzing the growth dynamics of trilobites revealed significant changes in post-embryonic axial growth at different developmental stages, which are closely related to sexual maturity in extant euarthropods. The observed body segmentation patterns in trilobites suggest a complex series of changing growth controls, indicating a more complex development than previously thought.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2021)
Article
Paleontology
Yifan Wang, Jin Peng, Qiujun Wang, Rongqin Wen, Hui Zhang, Guangying Du, Yunbin Shao
Summary: Understanding the moulting behavior of trilobites through different growth stages, this study focuses on the detailed exploration of moulting behaviors in Arthricocephalites xinzhaiheensis based on a large number of disarticulated specimens. The findings show that the trilobites commonly utilized cephalic sutures and cephalothoracic joint for moulting, involving rotation or inversion of the cranidium to create a wide exuvial gape.
Article
Geography, Physical
Russell D. C. Bicknell, James D. Holmes, Stephen Pates, Diego C. Garcia-Bellido, John R. Paterson
Summary: The Cambrian explosion marked the rapid development of complex marine ecosystems on Earth due to predator-prey interactions, which led to the evolution of biomineralised exoskeletons and shell-crushing predators. Injured trilobite specimens from Kangaroo Island, South Australia show evidence of attacks mostly on the posterior thorax, suggesting predators attacked from behind. Larger individuals were more likely to survive attacks and exhibit healed injuries, indicating smaller individuals were likely consumed during an attack.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Paleontology
Harriet B. Drage, James D. Holmes, Diego C. Garcia-Bellido, John R. Paterson
Summary: Trilobites exhibit a wide range of moulting configurations, and there is no true association between moulting behavior and body proportions except for body length. The study highlights the importance of considering museum collection bias in paleontological analyses.
Article
Geosciences, Multidisciplinary
Yifan Wang, Jorge Esteve, Xinglian Yang, Rongxing Yu, Dezhi Wang
Summary: This study reports on two specimens of eodiscid trilobites, which show a Somersault configuration using facial and rostral sutures to create an anterior exuvial gape. This discovery is important for understanding trilobite moulting behavior during the Cambrian period.
GEOLOGICAL MAGAZINE
(2023)
Article
Geosciences, Multidisciplinary
Hua Yang, Liansheng Yang, Mingzhong Zhou
Summary: This study investigates the redox conditions of deep seawater during the Ediacaran-Cambrian transition in Pingyin, South China. The results show a transition from anoxic ferruginous to sulphidic conditions during this period, which may have had a global impact and contributed to the extinction of Ediacaran fauna.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Biology
Jinzhou Luo, Tong Wang, Xiaoqiang Pan, Qiaokun Dai, Liang Xiong, Xiaoxia Dong, Ziwei Liu, Hong Hua
Summary: This study discovered the earliest trilobite-brachiopod assemblage zone in South China, providing new insights into biostratigraphy in Sichuan and potential for correlation of siliciclastic rocks in the western margin of the Yangtze Platform.
HISTORICAL BIOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Yaqin Qiang, Jiaxin Peng, Zuchen Song, Jie Sun, Xiaofang Zhao, Guoxiang Li, Jian Han, Junfeng Guo
Summary: New well-preserved specimens of Anabarella were found in the Yanjiahe Formation in the Three Gorges area, confirming the presence of A. plana and revising the taxonomy of the genus in South China. The microstructures of A. plana suggest that it may have had a semi-infaunal mode of life and indicate its potential ancestral relationship with Watsonella.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geography, Physical
Hongjie Zhang, Haifeng Fan, Fang Zhang, Hanjie Wen
Summary: The study found that during the late Ediacaran to early Cambrian, there were common hypersaline conditions in shallow-water environments and brackish to normal seawater salinity in middle- to deep-water environments in the Nanhua Basin. Two transient low-salinity intervals were observed in the shallow-water regions due to increased freshwater inputs. The study also revealed that high salinity restricts metazoan diversification, while the combination of normal seawater salinity and oxic watermass promotes biological explosion.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Biology
Michel Schmidt, Xianguang Hou, Dayou Zhai, Huijuan Mai, Jelena Belojevic, Xiaohan Chen, Roland R. Melzer, Javier Ortega-Hernandez, Yu Liu
Summary: The study focuses on the rare euarthropod Pygmaclypeatus daziensis from the Chengjiang biota, using micro-computed tomography to examine its ventral appendage organization and explore its functional ecology and evolutionary significance. The research reveals a high degree of appendage heteronomy and suggests that a nekto-benthic mode of life and scavenging/detritus feeding strategy for P. daziensis. The findings also highlight the phylogenetic significance of appendage heteronomy within Artiopoda.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2022)
Article
Geology
Haiying Yang, Zhifang Zhao, Yong Xia, Jiafei Xiao
Summary: The research found that REY in the Zhijin phosphorite mainly exists in apatites by isomorphous substitution, adsorbed by Fe-/Mn oxides/hydroxides or organic matters. Nd and Ce-anom plots indicate lower sedimentation rates of REY, allowing sufficient time for REY absorption in seawater. Apart from variations in ocean chemistry, constrained paleogeography provided a suitable space for REY entering apatite crystals.
SEDIMENTARY GEOLOGY
(2021)