New species Dalembia jiayinensis (Magnoliopsida) from the Upper Cretaceous Yong'ancun Formation,Heilongjiang, northern China |
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| Affiliation: | 1. Dipartimento di Scienze Chimiche e Geologiche, Via Trentino 51, I-09127 Cagliari, Italy;2. Museo di Scienze Naturali dell''Alto Adige, Via dei Bottai 1, I-39100 Bolzano, Italy;3. Department für Geo- und Umweltwissenschaften, Paläontologie und Geobiologie, Ludwig-Maximilians-Universität, Richard-Wagner-Straße 10, 80333 Munich, Germany;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Geosciences and Technology, Southwest Petroleum University, Chengdu 610500, China;4. University of Bucharest, Faculty of Geology and Geophysics, Department of Geology and Doctoral School of Geology, Laboratory of Palaeontology, 1, N. Bălcescu Ave, Bucharest 010041, Romania;5. Department für Geo- und Umweltwissenschaften, Paläontologie und Geobiologie, Ludwig- Maximilians- Universität, München, Germany;6. Bayerische Staatssammlung für Paläontologie und Geobiologie, München, Germany;7. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610000, China;8. Nanjing College, University of Chinese Academy of Sciences, Nanjing 210006, China |
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| Abstract: | Leaves of Dalembia jiayinensis sp. nov. are reported from the Santonian Yong'ancun Formation exposed along the Heilongjiang (Amur) River in Jiayin County, Northeast China. The leaves are compound, odd-pinnate, consisting of five leaflets. Leaflets are pinnately-lobed, trilobate or unlobed, elliptic, oblong, elliptic-rhomboid or ovate in outline, with blunt or rounded apex and the leaflet base is variable being cuneate, slightly decurrent, truncate or slightly cordate and sometimes asymmetric. Margin is entire or lobed. Lobes are short, simple, decreasing upwards, with wide and rounded sinuses. Apices of the lobes are usually rounded, sometimes notched. Venation is pinnate or palmately-pinnate, craspedodromous or semi-craspedodromous. The new species D. jiayinensis extends both the geographical and stratigraphic ranges of the genus Dalembia. This is the first occurrence of Dalembia in China and the most southern and youngest (Santonian) occurrence of this genus. |
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| Keywords: | Yong'ancun Formation Jiayin Heilongjiang (Amur) River Late Cretaceous Santonian Northeastern Asia |
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