Chengdu Center, China Geological SurveyHost
Advanced Search
Previous Article Next Article
2022 Vol. 42, No. 4
Article Contents
Article navigation > Sedimentary Geology and Tethyan Geology > 2022 > 42(4): 556-571
Next Article Previous Article

WEN Qianqian, ZHANG Qiyue, MIN Xiao, ZHOU Changyong, WEN Wen, HU Shixue, HUANG Jinyuan. 2022. Characteristics of the newborns of Keichousaurus hui. (Reptilia Sauropterygia) from Xingyi Fauna(Ladinian,Middle Triassic), Guizhou Province. Sedimentary Geology and Tethyan Geology, 42(4): 556-571. doi: 10.19826/j.cnki.1009-3850.2022.04007
Citation: WEN Qianqian, ZHANG Qiyue, MIN Xiao, ZHOU Changyong, WEN Wen, HU Shixue, HUANG Jinyuan. 2022. Characteristics of the newborns of Keichousaurus hui. (Reptilia Sauropterygia) from Xingyi Fauna(Ladinian,Middle Triassic), Guizhou Province. Sedimentary Geology and Tethyan Geology, 42(4): 556-571. doi: 10.19826/j.cnki.1009-3850.2022.04007
shu

Characteristics of the newborns of Keichousaurus hui. (Reptilia Sauropterygia) from Xingyi Fauna(Ladinian,Middle Triassic), Guizhou Province

  • 1. College of Earth Sciences and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;

  • 2. Chengdu Center, China Geological Survey, Chengdu 610081, China;

  • 3. Nanjing university, Nanjing 210023, China

More Information
  • Corresponding author: ZHANG Qiyue  
Received Date:  15 February 2022
Revised Date:  18 March 2022
    Abstract
  • In this paper, 12 specimens with embryos and 49 newborns of the Keichousaurus hui from the Xinyi fauna of the Ladinian, the Middle Triassic are observed and measured.The ratio relationships of specific traits of body length, length of the humerus, femur and orbital length of the adult individuals and newborns have been carried on the statistical analysis. The characteristics of adult, embryo and young individuals are demonstrated, and the morphological characteristics of newborn of the Keichousaurus hui are described for the first time. The skull, cervical vertebra, dorsal vertebra, sacral vertebra, caudal vertebra and limbs of newborns of the Keichousaurus hui are quantitatively described. Besides, more complete and accurate anatomical information is obtained. The new materials show that the average length of the skull is 8.56mm, the humerus is shorter than the femur, and the ratio of humerus/femur is 1∶1.09. The head is triangular, the snout is short and blunt, the orbit is large and round with a unique narrow superior temporal foramen. In addition, it is demonstrated that the fetal head of the Keichousaurus hui is firstly produced from the maternal birth canal. Meanwhile, the distance between snout and hip of the newborns keep stable with a range of 31.04~32.26mm. Furthermore the change of this value is not directly related to the maternal size. This study provides new materials for the research of reproductive mode, ontogeny, especially allallic growth of the Keichousaurus hui.
    • FullText(HTML)
  • 加载中
    • References
  • Cheng Y N, Wu X C, Ji Q, et al., 2004. Triassic marine reptiles gave birth to live young[J]. Nature, 432: 383-386.

    Google Scholar

    Cheng Y N, Holmes R, Wu X C, et al.,2009. Sexual Dimorphism and Life History of Keichousaurus hui (Reptilia: Sauropterygia)[J]. Journal of Vertebrate Paleontology, 29 (2): 401-408.

    Google Scholar

    CurrieP Jand Carroll R L,1984. Ontogenetic changesin the eosuchian reptile Thadeosaurus[J]. Journal of Vertebrate Paleontology, 4: 68-84.

    Google Scholar

    Holmes, Cheng Y N, Wu X C, et al.,2010. New information on the skull of Keichousaurus hui (Reptilia: Sauropterygia) with comments onsauropterygian interrelationships[J]. Journal of Vertebrate Paleontology, 28 (1): 78-84.

    Google Scholar

    Lin K and Rieppel O, 1998. Functional morphology and ontogeny of Keichousaurus hui (Reptilia: Sauropterygia)[J]. Fieldiana：Geology, N. S., 39: 1-35.

    Google Scholar

    Motani R, Jiang D Y, Riepple O, et al.,2015. Adult sex ration, sexual dimorphism and sexual selection in a Mesozoic reptile[J]. Proceedings of the Royal Society B: Biological Sciences, 282(1815): 1-7.

    Google Scholar

    Motani R, Jiang D Y, Andrea T, et al.,2014. Terrestrial Origin of Viviparity in Mesozoic Marine Reptiles Indicated by Early Triassic Embryonic Fossils[J]. PLOS ONE, 9(2): 1-6.

    Google Scholar

    Sander P M, 1989. The pachypleurosaurids (Reptilia: Nothosauria) from the Middle Triassic of Monte San Giorgio (Switzerland) with the description of a new species[J]. Philosophical Transactions of the Royal Society of London, Ser B: Biological Sciences, 325: 561-666.

    Google Scholar

    Xue Y, Jiang D, Motani R, et al., 2015. New information on sexual dimorphism and allometeic growth in Keichousaurus hui, apachypleurosaur from the Middle Triassic of Guizhou, South China[J]. Acta Palaeontologica Polonica, 60(3): 681-687.

    Google Scholar

    程龙,2015.滇黔地区中晚三叠纪之交海生爬行动物演替研究[D].武汉:中国地质大学,9-125.

    Google Scholar

    付宛璐,张璇,季承,等,2013.贵州兴义中三叠世胡氏贵州龙形态特征及生殖方式初[J].北京大学学报(自然科学版),49(5):839-846.

    Google Scholar

    蒋志文,2002.云南富源贵州龙动物群的发现及意义[J].云南地质,21(2):183-191.

    Google Scholar

    秦燕娇,喻美艺,罗永明,2014.胡氏贵州龙的个体发育研究[J].贵州地质,31(3):210-214.

    Google Scholar

    秦燕娇,2014.胡氏贵州龙个体发育及其生态环境研究[D].贵州:贵州大学资源与环境学院,1-62.

    Google Scholar

    孙燕燕,2012.温暖气候区蜥蜴卵胎生进化的选择优势[D].南京:南京师范大学生命科学学院,1-98.

    Google Scholar

    王立亭,1996.胡氏贵州龙(Keichousaurushui)的产出层序及时代讨论[J].贵州地质,13(3):209-212.

    Google Scholar

    王立亭,2000.贵州中晚三叠世海生爬行动物研究概况[J].贵州地质,17(1):27-29.

    Google Scholar

    吴延庆,2017.蛇类卵胎生繁殖模式选择劣势的生理和遗传补偿机制[D].南京:南京师范大学生命科学学院,1-155.

    Google Scholar

    杨钟健,1958.贵州新发现的肿肋龙化石[J].古脊椎动物学报,2(2-3):69-81.

    Google Scholar

    杨钟健和董枝明,1972.中国三叠纪水生爬行动物[M].北京:科学出版社,17-27.

    Google Scholar

    杨瑞东,1997.兴义顶效贵州龙动物群的古生态环境讨论[J].贵州地质,14(1):35-39.

    Google Scholar

    • Relative Articles
  • Cited by
  • Supplements
    • Proportional views
  • 加载中
通讯作者: 陈斌, bchen63@163.com
  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

  1. 本站搜索
  2. 百度学术搜索
  3. 万方数据库搜索
  4. CNKI搜索
Export Citation
PDF
XML

Article Metrics

Article views(1248) PDF downloads(99) Cited by(0)

Access History

Other Articles By Authors

Catalog

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    版权所有：中国地质调查局发展研究中心 copyright @2020