| Two New Fossil Sawflies (Hymenoptera, Xyelidae, Xyelinae) from the Middle Jurassic of China |
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| 作者姓名： | WANG Mei Alexandr P. RASNITSYN and REN Dong |
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| 作者单位： | 1 College of Life Sciences, 105 Xisanhuanbeilu, Haidian District, Capital Normal University, Beijing 100048, China; 2 Arthropoda Laboratory, Palaeontological Institute, Russian Academy of Sciences, 117997 Moscow, Russia; 3 Natural History Museum, Cromwell Road, London SW7 5BD, UK |
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| 基金项目： | This research is supported by the National Basic Research Program of China (973 Program) (2012CB821906), the National Natural Science Foundation of China (No. 31230065, 41272006) and KEY project of the Beijing Municipal Commission of Education (KZ201310028033), Program for Changjiang Scholars and Innovative Research Team in University (IRT13081), and for APR, by the Presidium RAS Program “Origin of biosphere and evolution of the geo-biological system”. |
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| 摘 要： | Two new genera with two new species of sawflies, Cathayxyela extensa gen. et sp. nov. and Aequixyela immensa gen. et sp. nov., from the Middle Jurassic Jiulongshan Formation of southeastern Inner Mongolia, China, are assigned to the subfamily Xyelinae （Hymenoptera, Xyelidae）. Cathayxyela gen. nov. can be distinguished by the third antennal article longer than the head; mesoprescutum and mesoscutellum nearly equal in length; the forewing with Sc meeting C before the junction of 1-M and 1- Rs; a weak and narrow pterostigma; and 3-Cu at least 1.5 times longer than the lm-cu. Aequixyela gen. nov. is characterized by the third antennal article nearly as long as the head; the forewing with Rs＋M approximately equal to 2-Rs in length; 2m-cu inclined toward the wing base and nearly reaching the middle of cell 3rm; lm-cu as long as the 2-Cu and 3-Cu; and the cell 2cua of regular hexagonal shape.
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| 关 键 词： | 中侏罗世 膜翅目 叶蜂 中国 化石 九龙山组 几乎相等 正六边形 |
| 收稿时间： | 2013/10/9 0:00:00 |
| 修稿时间： | 2014/2/10 0:00:00 |
Two New Fossil Sawflies （Hymenoptera,Xyelidae, Xyelinae） from the Middle Jurassic of China |
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| Authors: | WANG Mei Alexandr P RASNITSYN REN Dong |
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| Institution: | RASNITSYN, REN Dong(1. College of Life Sciences, 105 Xisanhuanbeilu, Haidian District, Capital Normal University, Beijing 100048, China; 2 Arthropoda Laboratory, Palaeontological Institute, Russian Academy of Sciences, 117997 Moscow, Russia; 3 Natural History Museum, Cromwell Road, London SW7 5BD, UK) |
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| Abstract: | Two new genera with two new species of sawflies,Cathayxyela extensa gen.et sp.nov.and Aequixyela immensa gen.et sp.nov.,from the Middle Jurassic Jiulongshan Formation of southeastern Inner Mongolia,China,are assigned to the subfamily Xyelinae(Hymenoptera,Xyelidae).Cathayxyela gen.nov.can be distinguished by the third antennal article longer than the head; mesoprescutum and mesoscutellum nearly equal in length; the forewing with Sc meeting C before the junction of 1-M and 1-Rs; a weak and narrow pterostigma; and 3-Cu at least 1.5 times longer than the 1m-cu.Aequixyela gen.nov.is characterized by the third antennal article nearly as long as the head; the forewing with Rs+M approximately equal to 2-Rs in length; 2m-cu inclined toward the wing base and nearly reaching the middle of cell 3rm; 1m-cu as long as the 2-Cu and 3-Cu; and the cell 2cua of regular hexagonal shape. |
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| Keywords: | Invertebrate paleontology taxonomy Arthropoda Daohugou Inner Mongolia |
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