Ancient spine discovered 390 million years ago in the medium mud basin armor turtules

[Global Network Science and Technology Comprehensive Report] On July 14th, the reporter learned from the official website of the Chinese Academy of Sciences that recently, Meng Xinyuan, a master's degree graduate of the Institute of Ancient Human Research Institute of the Chinese Academy of Sciences In the Journal, the latest research results on the polysmis of mud, bonsai, and gills.

The study was first reported on the Dongfangaspis (DONGFASPIS), a polygonal fossil (about 390 million years ago), in the northeast of Chuxiong and Yi Autonomous Prefecture, Yunnan Chuxiong and Yi Autonomous Prefecture. So far, the most known gill pork turtle turtles can be reached up to 45 pairs, which is more than 7 times that of the most primitive armor in the Zhili period.

According to reports, the number of gill sacs in armor of armor is doubled, which is difficult to explain the evolutionary phenomenon. The new discovery shows that it may be an evolutionary response to the hypoxic incident that the armor is repeatedly occurred in the early mud. The secret to survive to Zhongnu Penji. The new discovery is the first report of the fossils of the mud pelvic armor fossil in Yunnan Province. It is also the current fossil record of the second medium mud pelvic armor in my country. The Prague period (about 410 million years ago) expanded to the middle of the Mud Pen Pen Shi Eiffel (about 390 million years ago), which lasted about 20 million years back. Geological research has enhanced the understanding of scientists' radiation evolution and diffusion and migration routes of armor in the mud of armor, and it is important to explore the number of gill sacs of armfish and the collaborative evolution of the early marine hypoxia incident in the early period. significance.

This study shows that Oriental Fish survived in the early and in the biological incidents of the middle period, and had survived to the Mud Pen Pole World. From Yunnan Wanzhi to the morning-Zhongnu Penjin to the north to Ningxia's late mud pelvic world, and east to Guangxi's morning-Zhongnu Pen Bida is discovered, but the times and regions are different. They are different. It is still unsolvable when it starts to migrate and radiate to Ningxia and Guangxi, and it needs further research in the future.

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