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| 辽宁西部早白垩世九佛堂组热河鸟类一新属种 |
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王军有1, 王旭日2, 郭斌1, 康艾1, 马飞敏1, 鞠书彬2,3
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1.内蒙古自然博物馆, 内蒙古 呼和浩特 010010;2.中国地质科学院地质研究所/自然资源部地层与古生物重点实验室, 北京 100037;3.中国地质大学(北京)研究生院, 北京 100083
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| 摘要: |
| 辽宁朝阳早白垩世九佛堂组发现了一种新型热河鸟类化石。该化石不仅具有热河鸟类的典型特征，如尾椎由约28枚未愈合的椎体组成，中后部尾椎前后方向明显拉长；前颌骨无牙齿；齿骨后缘较直，靠近吻端腹侧明显膨大等，同时具有不同于其他已知热河鸟类的独具特征组合，如肱骨三角肌脊相对不发育；第三掌骨较直，与第二掌骨间距较小；后肢第一趾爪最大；尾椎脉弧、关节突不发育等。根据该化石的独特性及与其他热河鸟类特征对比研究，笔者建立了热河鸟类新属、新种：直掌内蒙鸟（Neimengornis rectusmim gen.et sp.nov.）。直掌内蒙鸟（新属、新种）的发现进一步丰富了热河鸟类的属种类群，为研究这一类群的形态特征和属种分异等提供了新的化石证据。 |
| 关键词: 热河生物群 早白垩世 辽宁西部 热河鸟目 |
| DOI：10.12097/j.issn.1671-2552.2021.09.003 |
| 分类号:P534.53;Q915.2 |
| 基金项目:国家自然科学基金项目《中国东北大兴安岭地区热河生物群鸟类化石新发现及其古地理意义》（批准号：41872018）、《江西赣州地区恐龙动物群研究》（批准号：41672019）和中国地质调查项目《全国重要古生物化石调查与保护监测示范》（编号：DD20190602） |
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| A new jeholornithiform identified from the Early Cretaceous Jiufotang Formation in western Liaoning |
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WANG Junyou1, WANG Xuri2, GUO Bin1, KANG Ai1, MA Feimin1, JU Shubin2,3
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1.Inner Mongolia Museum of Natural History, Huhhot 010010, Inner Mongolia, China;2.Institute of Geology, Chinese Academy of Geological Sciences/Key Laboratory of Stratigraphy and Paleontology of the Ministry of Natural Resources, Beijing 100037, China;3.Graduate School, China University of Geosciences, Beijing 100083, China
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| Abstract: |
| A new specimen of jeholornithiform was identified from the Early Cretaceous Jiufotang Formation in Chaoyang of Liaoning Province.This specimen shows typical characters of Jeholornithiformes,such as the long bony tail composed of about 28 free caudal vertebrae,the middle and posterior caudal vertebrae elongated antero-posteriorly,the edentulous premaxilla,and the dentary with a straight ventral margin posteriorly and a robust anterior end expanded ventrally.It differs from all other jeholornithiforms in the following unique combination of features:the relatively undeveloped deltopectoral crest of the humerus,the straight third metacarpal,which forming a small gap with the second metacarpal,the largest hallux ungula,and the undeveloped chevrons and zygapophyses of the caudal vertebrae.On the basis of unique characteristics and comparisons with other jeholornithiforms,a new genus and species(Neimengornis rectusmim gen.et sp.nov.) were erected.The identification of Neimengornis rectusmim further enriches the diversity of jeholornithiforms and sheds new light on understanding the morphology and classification of this clade. |
| Key words: Jehol Biota Early Cretaceous western Liaoning jeholornithiformes |