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早三叠世南漳湖北鳄（双孔类：湖北鳄目）的四肢特征

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文章导航 > 华南地质 > 2022 > 38(1): 174-187

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杨晨, 方子晨, 程龙, 阎春波, 李姜丽, 邹亚锐, 赵璧, 牛东毅, 牛志军. 2022. 早三叠世南漳湖北鳄（双孔类：湖北鳄目）的四肢特征. 华南地质, 38(1): 174-187. doi: 10.3969/j.issn.2097-0013.2022.01.013
引用本文: 杨晨, 方子晨, 程龙, 阎春波, 李姜丽, 邹亚锐, 赵璧, 牛东毅, 牛志军. 2022. 早三叠世南漳湖北鳄（双孔类：湖北鳄目）的四肢特征. 华南地质, 38(1): 174-187. doi: 10.3969/j.issn.2097-0013.2022.01.013
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YANG Chen, FANG Zi-Chen, CHENG Long, YAN Chun-Bo, LI Jiang-Li, ZOU Ya-Rui, ZHAO Bi, NIU Dong-Yi, NIU Zhi-Jun. 2022. Limbs’ Characteristics of Hupehsuchusnanchangensis Young, 1972 (Diapsida: Hupehsuchia) from the Early Triassic of Hubei Province. South China Geology, 38(1): 174-187. doi: 10.3969/j.issn.2097-0013.2022.01.013
Citation: YANG Chen, FANG Zi-Chen, CHENG Long, YAN Chun-Bo, LI Jiang-Li, ZOU Ya-Rui, ZHAO Bi, NIU Dong-Yi, NIU Zhi-Jun. 2022. Limbs’ Characteristics of Hupehsuchusnanchangensis Young, 1972 (Diapsida: Hupehsuchia) from the Early Triassic of Hubei Province. South China Geology, 38(1): 174-187. doi: 10.3969/j.issn.2097-0013.2022.01.013
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早三叠世南漳湖北鳄（双孔类：湖北鳄目）的四肢特征

  • 1.中国地质科学院，北京100037；2.古生物与地质环境演化湖北省重点实验室，中国地质调查局武汉地质调查中心（中南地质科技创新中心），武汉430205; 3.中国地质大学（武汉）地球科学学院，武汉430074；4.湖北省地质科学研究院，湖北省地质局，武汉430034

  • 基金项目:

    国家自然科学基金(No. 41972014)、中国地质调查局地质调查项目（No. DD20221634）

详细信息
    作者简介: 杨晨(1997—)，男，硕士研究生，地层古生物学专业，Email: 913718238@qq.com
    通讯作者: 程龙(1977—)，男，正高级工程师，从事中生代海生爬行动物研究，E-mail：chengl@mail.cgs.gov.cn，ORCID：0000⁃0003⁃2516⁃6325

  • 中图分类号: P52；P534.51

Limbs’ Characteristics of Hupehsuchusnanchangensis Young, 1972 (Diapsida: Hupehsuchia) from the Early Triassic of Hubei Province

  • 1. Chinese Academy of Geological Sciences, Beijing 100037; 2. Hubei Key Laboratory of Paleontology and Geological Environment Evolution, Wuhan Center of China Geological Survey (Central South China Innovation Center for Geosciences), Wuhan 430205, Hubei, China; 3. School of Earth Science, China University of Geosciences (Wuhan), Wuhan 430074, Hubei, China; 4.Hubei Institute of Geosciences, Hubei Geological Bureau, Wuhan 430034, Hubei, China

More Information
    Corresponding author: CHENG Long

    摘要
  • 早三叠世南漳-远安动物群中海生爬行动物具有较高的丰度和分异度，南漳湖北鳄是其中丰度最高的物种。为了查明南漳湖北鳄的四肢形态学特征及分类学意义，继而探讨四肢的个体发育过程，本文选取了6件保存较为完好的反映不同生长阶段的化石标本，进行了详细形态学描述和相关数据分析。南漳湖北鳄的肱骨粗壮，桡骨和尺骨远端关节面膨大平直，近端腕骨三枚，远端腕骨四枚，指式为5-5-5-5-4；股骨远端呈规则多边形，胫骨近端较远端宽，腓骨近端较远端窄，近端跗骨三枚，远端跗骨四枚，趾式为5-4-4-3-2(?)。南漳湖北鳄的前肢和后肢均具有前三指/趾聚拢，后两指/趾向后分散的排列特点。前肢骨骼数据分析结果显示各标本均在同一条生长序列上，而后肢部分胫骨长和腓骨长相对股骨长的相关性较低，难以回归至同一条生长曲线。南漳湖北鳄腕骨部分具有延时骨化的现象，第四掌骨的形态差异可能与两性异形相关，孙氏南漳龙可能为南漳湖北鳄的幼年个体。
    The marine reptiles in the Nanzhang-Yuan’an fauna are noted for high abundance and diversity of marine reptile fossils, from which Hupehsuchusnanchangensis is the most enriched species. Aim to find out the morphological characteristics as well as taxonomic and ontogenic significances of limbs of Hupehsuchusnanchangensis, six well-preserved specimens in different growth stage are studied in this paper. As for forelimb, they have strong humerus andstraight distal facet of radius and ulna, with three proximal and four distal carpals shaping the 4-5-5-5-3phalangeal formula. Refereing to hindlimb, it is showed that the distal facet of femur is trapezoid-shaped, and the proximal facet of tibia is relatively wide as well as the proximal facet of fibula is narrow. Three proximal and four distal tarsals are presented and the phalangeal formula is 5-4-4-3-2. The anteriorthree digits are convergent and the posterior two digits are distributed caudally, in both manus and pes. Measurements of the forelimbs suggest that all the specimens are on the same growth sequence , but the length of the tibia and fibula seems hardly related to the femur for hindlimbs, hard to be presented on the same growth curve. There is delayed ossification for the carpals and sexual dimorphism may result in the morphological diversity of fourth metacarpal .It is concluded that NanchangosaurusSuni may be the younger individual of Hupehsuchusnanchangensis.
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收稿日期:  2021-12-12
修回日期:  2022-01-18

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