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First Asian fossil record of platydictya (Amblystegiaceae) from the lower Miocene and its paleoenvironmental significance

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Frontiers of Earth Science 2023年第1期17卷 351-360页

作者： Liyan GUO Liang XIAO Ya LI Xiangchuan LI Qin LENG Nan SUN Junfeng GUO Chaofeng FU Jianan WANG Deshuang JI College of Earth Sciences and Resources&Key Laboratory of Western Mineral Resources and Geological Engineering(the Ministry of Education) Chang᾽an UniversityXi᾽an 710054China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China Laboratory for Terrestrial Environments Bryant UniversitySmithfieldRI 02917USA Shaanxi Key Laboratory of Early Life and Environments&State Key Laboratoty of Continental Dynamics Northwest UniversityXi᾽an 710069China

Mosses form a diverse land plant group in modern vegetation but have rarely showed up in the fossil record compared with vascular plants. Here, we report an extraordinarily-preserved early Miocene moss fossil from the lower Laoliangdi Formation in the Pingzhuang Coal Mine in Chifeng, Inner Mongolia Autonomous Region, northern China. Although lacking rhizoids and most reproductive organs, the well-preserved fossil allows us to assign it to platydictya cf. jungermannioides (Amblystegiaceae) based upon its detailed gross and micro-morphology. The diagnostic characteristics include a small-sized body with slender stems bearing spirally arranged ovate-lanceolate leaves that lack costae. Leaf margins are mostly partly entire and partly dentate, a few dentate, and rarely completely entire. It represents the first fossil record of platydictya in Asia. The specific living microenvironment of the extant P. jungermannioides enriched our understanding of the early Miocene environment that was previously based upon vascular plant fossils and sedimentary lithofacies in the area. Our early Miocene platydictya cf. jungermannioides fossil lived in a warm and humid lush forest with a dense understory that received adequate water supplies.

关键词： moss the Pingzhuang Coal Mine Inner Mongolia platydictya paleoenvironment

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