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PubMed
Article by Wang J
Article by Li T
Article by Liu Z
Article by Guo B
Article by Kang A
Article by Na Y
Article by Li Y
Article by Bo J
Article by Sun C
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New discovery of Late Triassic liverworts from Yangcaogou, Beipiao, Liaoning, China
WANG Jun-you1, LI Tao2,4, LIU Zhi-ping1, GUO Bin1, KANG Ai1, NA Yu-ling2,3, LI Yun-feng2,3, BO Jun-chen5, SUN Chun-lin2,3
1. Inner Mongolia Nature Museum, Hohhot 010020, China;
2. Research Center of Paleontology and Stratigraphy, Jilin University, Changchun 130026, China;
3. Key Laboratory for Evolution of Past Life and Environment in Northeast Asia(Jilin University), Ministry of Education, Changchun 130026, China;
4. Geological Museum of Jilin University, Changchun 130026, China;
5. Yuxiu Culture Limited Liability Company of Lingyuan, Lingyuan 122500, Liaoning, China
Abstract: This paper firstly reports a doubtful liverwort from the Late Triassic Yangcaogou Formation of the Yangcaogou Basin in Beipiao, Liaoning, China. Lacking of definitive epidermal characters, these thalloid plants are assigned to the form genus Thallites that has neither clear cut algal nor bryophytic affinities, and a new species, Thallites yangcaogouensis sp. nov. is established. The thalloid plant is in nearly rounded shape, with thick thallus and entire margin. They dichotomously branch up three times regularly, the first two are deeply notched, the last is shallow notched, and forming triangular lob with blunt apex. A conspicuous and ridge-like midrib extends from the thallus base reaching the tip of the lobe. There are irregularly small bulges and hair-like imprints on the surface of the new species, which may be the impressions of the ventral scales and rhizoids of thallus, showing close resemblance with Marchantiales. According to the ecological analysis of living liverworts and the compositional features of Yangcaogou flora, it is possible that the new species grew on moist soils and rock surfaces near lakes or rivers in a warm and humid environment. This discovery of this group provides new evidence for understanding the Late Triassic paleogeography and paleoenvironment in western Liaoning, China.
Keywords: Genus Thallites   Upper Triassic   Yangcaogou Formation   Beipiao  
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DOI: 10.3969/j.issn.1004-5589.2019.01.001
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