Yanliaoa, an extinct genus of Cupressaceae s. l. from the Middle Jurassic,northeastern China |
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Authors: | Xiao Tan David L Dilcher Hongshan Wang Yi Zhang Yu-Ling Na Tao Li Yun-Feng Li Chun-Lin Sun |
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Institution: | 1. Research Center of Palaeontology and Stratigraphy, Jilin University, Changchun 130026, China;2. Key Laboratory for Evolution of Past Life and Environment in Northeast Asia, Ministry of Education, Jilin University, Changchun 130026, China;3. Department of Earth and Atmospheric Sciences, Indiana University, Bloomington, IN 47405, USA;4. Florida Museum of Natural History, University of Florida, Gainesville, FL 32611, USA;5. College of Paleontology, Shenyang Normal University, Shenyang 110034, China;6. Geological Museum of Jilin University, Changchun 130026, China |
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Abstract: | Yanliaoa is a common fossil in the Middle Jurassic of western Liaoning, eastern Inner Mongolia and northern Hebei Province, China. It is an important element of the Yanliao biota. The genus was established by Pan in 1977 for fossil plants from the Middle Jurassic Haifanggou Formation in Xiasanjiaochengzi, western Liaoning Province, and in present paper, the genus Yanliaoa is studied based on new material. Pan never designated a type specimen and his fossil material cannot be located. We designate a type specimen here for Yanliaoa, so that the genus name Yanliaoa remains valid. Yanliaoa sinensis Pan emend. Tan et al., is found in the same locality and formation as the lost specimens, Y. sinensis of Pan, 1977. Yanliaoa daohugouensis n. sp., a new species with epidermal anatomy, is from the Middle Jurassic Daohugou, Inner Mongolia. A holotype is also selected from the new material for this new species. Characters of the leafy shoots and ovulate cones of Yanliaoa are emended. The epidermal anatomy of this genus is described for the first time. Compared with other extant and extinct species of Cupressaceae s. l., the current species can be distinguished from any known species both by the leafy shoot characters and its epidermal anatomy. It further indicates that Yanliaoa is an extinct and endemic conifer found in the Middle Jurassic of northeastern China. |
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Keywords: | Cupressaceae Epidermal structure Middle Jurassic Daohugou biota |
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