Jianli XIONG,Xiuying LIU and Xiaomao ZENG.Discovery of an Internasal Bone in Hynobius maoershanensis (Urodela: Hynobiidae)[J].Asian Herpetological Research(AHR),2011,2(2):87-90.[doi:10.3724/SP.J.1245.2011.00087]
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Discovery of an Internasal Bone in Hynobius maoershanensis (Urodela: Hynobiidae)
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Asian Herpetological Research[ISSN:2095-0357/CN:51-1735/Q]

2011 VoI.2 No.2
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Original Article
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Discovery of an Internasal Bone in Hynobius maoershanensis (Urodela: Hynobiidae)
Jianli XIONG1 Xiuying LIU2 and Xiaomao ZENG 3 *
1 Animal Science and Technology College, Henan University of Science and Technology, Luoyang 471003, Henan, China
2 School of Agriculture, Henan University of Science and Technology, Luoyang 471003, Henan, China
3 Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China
salamander internasal bone skull anatomy individual variation
Internasal bones have generally been recorded in teleostean and tetrapod fossils, being absent in most extant vertebrates. Presently, there has been one case of the internasal bone discovered in a living salamander, Pseudohynobius puxiongensis (Caudata: Hynobiidae). The second case discovered in living salamanders is reported in this article, which is present in one of five specimens of Hynobius maoershanensis, a species endemic to China. This case is again regarded as individual variation. Thus, the presence of an “internasal bone” may represent intraspecific variation and is thus a misleading taxonomic character.


Beaumont E. I. 1977. Cranial morphology of the Loxommatidae (Amphibia: Labyrinthodontia). Phil Trans Roy Soc Lond B, 280: 29-101
Bolt J. R., Lombard R. E. 2010. Deltaherpeton hiemstrae, a new colosteid tetrapod from the Mississippian of Iowa. J Paleontol, 84(6): 1135-1151
Carroll R. L. 1964. Early evolution of the dissorophid amphibians. Bull Mus Comp Zool, 131: 161-250
Clack J. A. 1994. Acanthostega gunnari, a Devonian tetrapod from Greenland; the snout, palate and ventral parts of the braincase, with a discussion of their significance. Meddelelser om Gr?nland, Geoscience, 31: 1-24
Dalquest W. W., Scheffer V. B. 1944. Distribution and variation in pocket gophers, Thomomys talpoides, in the State of Washington. Am Nat, 78 (308-333): 423-450
Duellman W. E. Trueb L. 1994. Biology of Amphibians. Baltimore and London: The Johns Hopkins University Press
Fei L., Ye C. Y. 2000. A new hynobiid subfamily with a new genus and new species of Hynobiidae from west China. Cult Herpetol Sin, 8: 64-70 (In Chinese)
Goodrich E. S. 1958. Studies on the structure and development of vertebrates, Vol.1-2. London: Constable and Company Ltd.
Hanken J. 1984. Miniaturization and its effects on cranial morphology in plethodontid salamanders, genus Thorius (Amphibia: Plethodontidae) .I. Osteological variation. Biol J Linn Soc, 23(1): 55-75
Heatwole H., Carroll R. L. 2000. Amphibian Biology: Vol. 4, Palaeontology. The Evolutionary History of Amphibians. Chipping Norton: Surrey Beatty & Sons
Huttenlocker A. K., Pardo J. D., Small B. J. 2007. Plemmyradytes shintoni, gen. et sp. nov., an Early Permian amphibamid (Temnospondyli: Dissorophoidea) from the Eskridge Formation, Nebraska. J Vert Paleontol, 27: 316-328
Martin R. E. 1970. Cranial and bacular variation in populations of spiny rats of the genus Proechimys (Rodentia: Echimyidae) from South America. Smithsonian Contri Zool, 35: 1-19
Martínez J. J., Cola V. D. 2011. Geographic distribution and phenetic skull variation in two close species of Graomys (Rodentia, Cricetidae, Sigmodontinae). Zoologischer Anzeiger (In press)
Panchen A. L. 1980. The origin and relationships of the anthracosaur amphibia from the Late Palaeozoic, 319-350. In Panchen A. L. (ed.), The Terrestrial Environment and Origin of Land Vertebrates. London: Academic Press
Peng R., Zhang P., Xiong J. L., Gu H. J., Zeng X. M., Zou F. D. 2010. Rediscovery of Protohynobius puxiongensis (Caudata: Hynobiidae) and its phylogenetic position based on complete mitochondrial genomes. Mol Phyl Evol, 56: 252-258
Romer A. S., Parsons T. S. 1977. The vertebrate body. Philadelphia: Saunders Company
Schoch R. R., Rubidge B. S. 2005. The amphibamid Micropholis from the Lystrosaurus Assemblage Zone of South Africa. J Vert Paleontol, 25: 502-522
Shubin N., Wake D. B., Crawford A. J. 1995. Morphological variation in the limbs of Taricha granulosa (Caudata: Salamandridae): Evolutionary and phylogenetic implications. Evolution, 49(5): 874-884
Smith S. A., Arif S., Montes de Oca A. N., Wiens J. J. 2007. A phylogenetic hot spot for evolutionary novelty in middle American treefrogs. Evolution, 61(9): 2075-2085
Tan A. M. 1993. Systematics, phylogeny and biogeography of the northwest American newts of the genus Taricha (Caudata: Salamandridae). Unpubl. Ph. D. Diss., University of California, Berkeley
Trueb L. 1970. Evolutionary relationships of casque-headed treefrogs with co-ossified skulls. Publ. Univ. Kansas Mus. Nat Hist, 18: 547-716
Watson D. M. S. 1929. The carboniferous amphibia of Scotland. Palaeont Hung, 1: 219-252
Zhang M. W. 1986. Comparative anatomy of vertebrates. Beijing: Higher Education Press, 113-220 (In Chinese)
Zhou F., Jiang A. W., Jiang D. B. 2006. A new species of the genus Hynobius from Guangxi Zhuang Autonomous Region, China (Caudata, Hynobiidae). Acta Zool Sin, 31(3): 670-674 (In Chinese)


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