原颚龟(学名:Proganochelys quenstedti)是到目前为止已发现的最古老的陆生乌龟,可追溯到大约2亿年前的三叠纪晚期[3][4]。
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原颚龟生活在三叠纪的劳亚大陆,被发现于德国[5]、格陵兰[6]以及泰国。[7]
龟壳长度达70厘米,头部不能缩回壳中[8]。
G. Baur: Über den Ursprung der Extremitäten der Ichthyopterygia. In: Jahresberichte und Mitteilungen des Oberrheinischen geologischen Vereines 20, 1887, S. 17–20
Li, Chun; Xiao-Chun Wu, Olivier Rieppel, Li-Ting Wang & Li-Jun Zhao. An ancestral turtle from the Late Triassic of southwestern China. Nature. 2008-11-27, 456: 497–501. doi:10.1038/nature07533.
Reisz, Robert R.; Jason J. Head. Palaeontology: Turtle origins out to sea. Nature. 2008-11-27, 456: 450–451. doi:10.1038/nature07533.
E. S. Gaffney: The Comparative Osteology of the Triassic Turtle Proganochelys. In Bulletin of the AMNH 194, 1990, S. 1–263
F. A. Jr. Jenkins, N. H. Shubin, W. W. Amarel, S. M. Gatesy, C. R. Schaff, L. B. Clemmensen, W.R. Downs, A. R. Davidson, N. C. Bonde & F. Osbæck: Late Triassic continental vertebrates and depositional environments of the Fleming Fjord Formation, Jameson Land, East Greenland. In Meddelelser om Grønland, Geoscience 32, 1994, S. 1–25
E. Buffetaut & V. Suteethom: The geographical significance of the mesozoic vertebrates from Thailand. In Biogeography and Geological Evolution of SE Asia, Backbuys Publishers, Leiden 1998, S. 83–90.
M. Mlynarski: Testudines. Handbuch der Paläoherpetologie, Part 7. Verlag Dr. Friedrich Pfeil, 1976, S. 1-129.