碩鱷屬

碩鱷屬; 化石時期：早侏羅世，196.5–189.6 Ma PreЄ Є O S D C P T J K Pg N
科學分類
界：	動物界 Animalia
門：	脊索動物門 Chordata
綱：	蜥形綱 Sauropsida
總目：	恐龍總目 Dinosauria
目：	蜥臀目 Saurischia
亞目：	†蜥腳形亞目 Sauropodomorpha
屬：	†碩鱷屬 Pachysuchus; Young, 1951
模式種
	†不完整碩鱷; Pachysuchus imperfectus; Young, 1951

碩鱷（學名：Pachysuchus）是種存疑的基幹蜥腳形亞目恐龍，生存於早侏羅世的中國。

已知化石包括一塊保存較差的不完整吻突，發現於雲南下祿豐統（英語：Lower Lufeng Series），由中國古生物學家楊鍾健於1951年描述。^[1]模式種是不完整碩鱷（Pachysuchus imperfectus）。屬名可譯為「厚的鱷魚」，種名在拉丁語中意為「不完整的」。楊鍾健將吻突鑑定為屬於植龍目，這是一群形如鱷魚的長吻鑲嵌踝類。植龍目在三疊紀相當常見，但迄今未發現任何生存於侏羅紀的物種，一般認為該類群在三疊紀-侏羅紀滅絕事件中便已消失。楊鍾健描述的那塊吻突後來遺失，該屬的原始描述亦備受質疑。^[2]此標本保存不佳且出土於侏羅紀地層，令人懷疑碩鱷是否屬於植龍目。^[3]2012年，保羅·巴雷特和徐星重新尋獲不完整碩鱷正模標本IVPP V 40，並發現其實際上屬於分類不明的基幹蜥腳形亞目。兩人指出，碩鱷正模標本不具備任何獨特特徵或獨特特徵組合，雖有別於其它中國早侏羅世蜥腳形亞目的吻突，但不排除這些差異是由保存不善所致，使其成為一個疑名。^[4]

參考資料

^ Young, C.C. The Lufeng saurischian fauna in China. Palaeontologia Sinica, New Series C. 1951, 13: 1–96.
^ Padian, K. Did "thecodontians" survive the Triassic?. Lucas, S.G.; Hunt, A.P. (編). Dawn of the Age of Dinosaurs in the American Southwest. Albuquerque: New Mexico Museum of Natural History. 1989: 401–414.
^ Sun, A.-L.; Cui, K.H. A brief introduction to the Lower Lufeng saurischian fauna (Lower Jurassic, Lufeng, Yunnan, People's Republic of China). Padian, K. (編). The Beginning of the Age of Dinosaurs: Faunal Change Across the Triassic-Jurassic Boundary. New York: Cambridge University Press. 1986: 275–278.
^ Paul M. Barrett and Xu Xing. The enigmatic reptile Pachysuchus imperfectus Young, 1951 from the Lower Lufeng Formation (Lower Jurassic) of Yunnan, China (PDF). Vertebrata PalAsiatica. 2012, 50 (2): 151–159.

[1] Young, C.C. The Lufeng saurischian fauna in China. Palaeontologia Sinica, New Series C. 1951, 13: 1–96.

[PK89-2] Padian, K. Did "thecodontians" survive the Triassic?. Lucas, S.G.; Hunt, A.P. (編). Dawn of the Age of Dinosaurs in the American Southwest. Albuquerque: New Mexico Museum of Natural History. 1989: 401–414.

[SC86-3] Sun, A.-L.; Cui, K.H. A brief introduction to the Lower Lufeng saurischian fauna (Lower Jurassic, Lufeng, Yunnan, People's Republic of China). Padian, K. (編). The Beginning of the Age of Dinosaurs: Faunal Change Across the Triassic-Jurassic Boundary. New York: Cambridge University Press. 1986: 275–278.

[4] Paul M. Barrett and Xu Xing. The enigmatic reptile Pachysuchus imperfectus Young, 1951 from the Lower Lufeng Formation (Lower Jurassic) of Yunnan, China (PDF). Vertebrata PalAsiatica. 2012, 50 (2): 151–159.

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