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綦江龙属

綦江龙属
化石时期:白垩纪前期[1]115 Ma
科学分类 编辑
界: 动物界 Animalia
门: 脊索动物门 Chordata
纲: 蜥形纲 Sauropsida
总目: 恐龙总目 Dinosauria
目: 蜥臀目 Saurischia
亚目: 蜥脚形亚目 Sauropodomorpha
下目: 蜥脚下目 Sauropoda
科: 马门溪龙科 Mamenchisauridae
属: 綦江龙属 Qijianglong
Xing et al., 2015
模式种
果壳綦江龙
Qijianglong guokr

Xing et al., 2015

江龙属名Qijianglong)是一植食性蜥脚下目马门溪龙科恐龙[2]生存于白垩纪早期的中国[1]

发现

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1994年,四川省原綦江县古南镇河坝村村民蔡长明在自家后院首次发现綦江龙的一节椎骨。2006年,綦江区附近的建筑工地发现一个标本丰富的化石采石场。研究者因此对早期发现进行重新检查,并发现一具骨骼。2015年,模式种果壳綦江龙Qijianglong guokr)由邢立达中国地质大学)、宫下哲人(阿尔伯塔大学)、张建平、李大庆、叶勇(自贡恐龙博物馆)、关谷透(福井县立恐龙博物馆)、王风平、菲力普·柯里英语Philip John Currie命名、叙述,标本是一个包含头骨的部分骨骼。属名取自化石发现地綦江和汉语“龙”;种名致敬科普网站果壳网。[2]

正模标本QJGPM 1001发现于遂宁组英语Suining Formation的一层,地质年龄曾被认为是晚侏罗世,但近期的放射性测年将其年代定为白垩纪中期(阿普第阶晚期)。[1]由带有颅骨的部分骨骼组成,包括颅骨后部、部分右下颌、十七节完整的颈椎、前六节背椎、肋骨、疑似的第十节尾椎、二十八节后段尾椎、人字骨、左耻骨和两节趾骨,可能代表一个体型较大的未成熟个体。[2]

綦江龙正模标本长约十五米,拥有极长的颈部。描述者建立数个鉴别特征,其中四个为自衍征。在较低的脑壳上,翼基突呈板状,沿骨轴方向延伸,并有一个平行于基底结节的额外突起。颈椎正常关节面旁边的后关节突英语postzygapophysis外侧有额外的指形延伸,使颈部在水平面上变僵硬但可以垂直运动。后段颈椎在椎弓横突英语diapophysis、上肋骨关节突和神经棘之间的凹陷处具有气腔。耻骨前缘凹陷并强烈弯曲,导至其下端更偏向前方而非指向下方。[2]

分类

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綦江龙被置于马门溪龙科的基干位置,在分支图中位于天府峨眉龙上方。[2]

参考资料

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  1. ^ 1.0 1.1 1.2 Wang, J.; Norell, M. A.; Pei, R.; Ye, Y.; Chang, S.-C. Surprisingly young age for the mamenchisaurid sauropods in South China. Cretaceous Research. 2019. ISSN 0195-6671. doi:10.1016/j.cretres.2019.07.006. 
  2. ^ 2.0 2.1 2.2 2.3 2.4 Xing, L; Miyashita, T; Zhang, J; Li, Daqing; Ye, Y; Sekiya, T.; Wang F; Currie, P. A new sauropod dinosaur from the Late Jurassic of China and the diversity, distribution, and relationships of mamenchisaurids (PDF). Journal of Vertebrate Paleontology. 26 Jan 2015, 35: e889701 [2021-12-16]. S2CID 86062974. doi:10.1080/02724634.2014.889701. (原始内容 (PDF)存档于2015-05-01). 
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綦江龙属
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