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A snake with legs from the marine Cretaceous of the Middle East

Abstract

Although snakes are descended from limbed squamates ('lizards'), all known snakes lack well developed legs and their nearest lizard relatives have yet to be identified1–4. Here we provide compelling evidence that the Cretaceous squamate Pachyrhachis problematicus, previously interpreted as a varanoid lizard5–7, is actually a primitive snake with a well developed pelvis and hindlimbs. Pachyrhachis is the sister-taxon of all other snakes. The skull exhibits most derived features of modern snakes, and the body is slender and elongated. But unlike other snakes, Pachyrhachis retains a well developed sacrum, pelvis and hindlimb (femur, tibia, fibula, tarsals). Pachyrhachis was marine, and provides additional support for mosasauroid–snake affinities.

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References

  1. 1

    Bellairs, A.d'A. & Underwood, G. The origin of snakes. Biol. Rev. 26, 193–237 (1951).

    CAS  Article  Google Scholar 

  2. 2

    Rieppel, O. A review of the origin of snakes. Evol. Biol. 22, 37–130 (1988).

    Article  Google Scholar 

  3. 3

    Estes, R., de Queiroz, K. & Gauthier, J. in Phylogeneic Relationships of the Lizard Famiies (eds Estes, R. & Pregill, G.) 119–281 (Stanford University Press, Stanford, 1988).

    Google Scholar 

  4. 4

    Rage, J.-C. in Snakes: Ecology and Evolutionary Biology (eds Seigel, R. A., Collins, J. T. & Novak, S. S.) 51–76 (Macmillan, New York, 1987).

    Google Scholar 

  5. 5

    Haas, G. On a snakelike reptile from the Lower Cenomanian of Ein Jabrud, near Jerusalem. Bull. Mus. Natl Hist. Nat., Paris, 4th ser. 1, 51–64 (1979).

    Google Scholar 

  6. 6

    Haas, G. Pachyrhachis problematicus Haas, snakelike reptile from the Lower Cenomanian: ventral view of skull. Bull. Mus. Natn. Hist. Natl, Paris, 4th ser. 2, 87–104 (1980).

    Google Scholar 

  7. 7

    Haas, G. in Aspects of Vertebrate History, Essays in Honor of E. H. Colbert (ed. Jacobs, L.) 177–192 (Museum of Northern Arizona Press, Flagstaff, 1980).

    Google Scholar 

  8. 8

    Chalifa, Y. & Tchernov, E. Pachyamia latimaxillaris, new genus and species (Actinopterygii; Amiidae) from the Cenomanian of Jerusalem. J. Vert. Paleont. 2, 269–285 (1982).

    Article  Google Scholar 

  9. 9

    Wallach, V. A new name for Ophiomorphus colberti Haas, 1980. J. Herpetol 2, 269–285 (1984).

    Google Scholar 

  10. 10

    Caldwell, M. W. Ontogeny and phylogeny of the mesopodial skeleton in mosasauroid reptiles. Zool J. Linn. Soc. 116, 407–436 (1996).

    Article  Google Scholar 

  11. 11

    Gauthier, J., Estes, R. & de Queioz, K. in Phylogenetic Relationships of the Lizard Families (eds Estes, R. & Pregill, G.) 15–98 (Stanford University Press, Standford, 1988).

    Google Scholar 

  12. 12

    Underwood, G. A Contribution to the Classification of Snakes (British Museum (Natural History), London, 1967).

    Google Scholar 

  13. 13

    Lee, M. S. Y. The phylogeny of varanoid lizards and the affinities of snakes. Phil. Trans. R. Soc. Lond. B 352, 53–91 (1997).

    ADS  Article  Google Scholar 

  14. 14

    Cundall, D., Wallach, V. & Rossman, D. A. The systematic relationships of the snake genus Anomochilus. Zool. J. Linn. Soc. 109, 275–299 (1993).

    Article  Google Scholar 

  15. 15

    Bellairs, A. d'A. in Studies in Vertebrate Evolution (eds Joysey, K. & Kemp, T.) 157–172 (Oliver & Boyd, Edinburgh, 1972).

    Google Scholar 

  16. 16

    Underwood, G. Simplification and degeneration in the course of evolution of squamate reptiles. Coll. Int. CNRS 266, 341–352 (1976).

    Google Scholar 

  17. 17

    Cope, E. D. On the reptilian orders Pythonomopha and Streptosauria. Proc. Boston Soc. Nat. Hist. 12, 250–267 (1869).

    Google Scholar 

  18. 18

    Nopcsa, F. Eidolosaurus und Pachyophis. Zwei neue Neocom-Reptilien. Palaeontographica 65, 97–154 (1923).

    Google Scholar 

  19. 19

    Wu, X., Brinkman, D. & Russell, A. P. Sineoamphisbaena hexatabularis, an amphisbaenian (Diapsida: Squamata) from the Upper Cretaceous redbeds at Bayan Mandahu (Inner Mongolia, People's Republic of China), and comments on the phylogenetic relationships of the Amphisbaenia. Can. J. Earth Sci. 33, 541–577 (1996).

    ADS  Article  Google Scholar 

  20. 20

    Caldwell, M. W. On the phylogenetic relationships of coniasaurs, mosasauroids, and snakes within Squamata. Zool. J. Linn. Soc. (submitted).

  21. 21

    Scanlon, J. D. Studies in the Palaeontology and Systematics of Australian Snakes. Thesis, Univ. New South Wales (1996).

    Google Scholar 

  22. 22

    Russell, D. A. Systematics and morphology of American mosasaurs. Bull. Peabody Mus. Nat. Hist. 23, 1–241 (1967).

    Google Scholar 

  23. 23

    Edmund, A. G. in Biology of the Reptilia (eds Cans, C., Bellairs, D.d'A. & Parsons, T. S.) 117–200 (Academic, New York, 1969).

    Google Scholar 

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Caldwell, M., Lee, M. A snake with legs from the marine Cretaceous of the Middle East. Nature 386, 705–709 (1997). https://doi.org/10.1038/386705a0

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