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| The Cambrian Life Explosion and a Major Breakthrough in the Origin of Animals |
| Chinese scholars found the earliest fossil of bryozoans on earth |
A few days ago, Zhang Zhiliang, a doctoral student under the guidance of Professor Zhang Zhifei from the early life research team of Northwest University, found several millimeters in the detrital limestone of the Xihaoping section of the Dengying Formation, Xiaoyang Section, Xiaoyang Town, Ba County, Zhenba County, Southern Shaanxi Province.
Of micro-fossils
.
Based on the preliminary research of the research group, and cooperating with Glenn Brock, a professor at Macquarie University in Australia and an adjunct professor at Northwestern University, and with the Nanjing Institute of Geology and Palaeontology of the Chinese Academy of Sciences, the British Museum of Natural History, the Swedish Museum of Natural History, etc.
The research was published in the journal Nature on October 27 in a long article
.
The earliest restoration of bryozoans.
Photocourtesy of Zhang Zhifei's team
Bryozoa (Bryozoa) is a true body cavity animal with a tentacle crown.
It is a type of aquatic group fixed benthic animals, mostly marine, living in groups, presenting a branch shape, and its appearance resembling bryophytes.
It is a typical "grass-rooted animal".
"
.
The Cambrian eruption is the most magnificent explosion of animal life on both sides known on earth.
In the earth’s oceans 530 million years ago, almost all living animals including vertebrates suddenly appeared explosively.
Representatives of early ancestors
.
These include large predators and a variety of exotic animal types, which are preserved vividly in the fossils found in the Cambrian Special Fossil Library
Fossil scan details Photo courtesy of Zhang Zhifei's team
Fossil scan details In the research, Zhang Zhifei's team, funded by the National Natural Science Foundation of China, used scanning electron microscopy and X-ray tomography to analyze the fossils and found that these fossils are two-way thin slab-like meshes, back to back covered with epidermal cells secreting chitin
.
The worm chamber lacks obvious mineralization.
After 52 characteristics, 18 taxa and 2 outer groups, the largest parsimonious method and Bayesian clade system analysis showed that this fossil bryozoan represents the backbone group of fossils and extant bryozoans, and is the most primitive ancestor type
.
Schematic diagram of the surface structure of bryozoans Photo courtesy of Zhang Zhifei's team
Schematic diagram of the surface structure of bryozoans According to reports, this research will advance the geological history of the bryozoa from the Ordovician to the early Cambrian eruption, and advance the geological history of the bryozoa by at least 50 million years
.
The study found that the modular growth and community distribution of animals on both sides were much earlier than expected, indicating that modern bryozoans may have originated from social ancestor types rather than single living ancestors
"The discovery of fossils in the argillaceous limestone of the Xihaoping section of the Dengying Formation indicates that the Cambrian bryozoans are similar to those of the later genus and are suitable for living in a clear hard bottom environment, thus revealing the peculiarities preserved in the shale.
The reason for the lack of bryozoan fossils in the type fossil library
.
” Zhang Zhifei said that the discovery provides new evidence for the formation of earth animal trees and the Cambrian life explosion, indicating that the study of peculiar fossils cannot fully reveal the history of life evolution in earth history.
Related paper links: https://
