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''Chelodina canni'' McCord & Thomson 2002,〔McCord W, Thomson S. 2002. A new species of ''Chelodina'' (Testudines: Pleurodira: Chelidae) from Northern Australia. ''Journal of Herpetology'' 36 (2): 255-267.〕 commonly known as Cann's snake-necked turtle, is an Australian species found in the northern and north eastern parts of the continent. It has a narrow zone of hybridization with its related species the eastern snake-necked turtle, ''Chelodina longicollis''. For many years this species was assumed to be the same species as ''Chelodina novaeguineae'' from New Guinea, however recently it has been shown that these two species differ both morphologically and genetically. Hence it was separated and described as a unique species in 2002. ==Taxonomy== :Order: Testudines Linnaeus, 1758 :Suborder: Pleurodira Cope, 1864 :Family: Chelidae Ogilby, 1905 :Subfamily: Chelodininae Baur, 1893: 211〔Baur G. 1893. Notes on the classification and taxonomy of the Testudinata. ''Proceedings of the American Philosophical Society'' 31: 210–225.〕 ''Type data''.- Holotype: NTM 24515; an adult female (carapace length, CL = 215.3mm; carapace width, CW8 = 167.2mm), preserved in alcohol; collected with the help of local aboriginal people at Malogie Waterhole, near Scarlet Hill on Kalala Station (16° 08' S, 133° 36' E), Northern Territory, Australia. ''Etymology''.- This species is named in honour of John Robert Cann (born 1938) of Sydney, Australia for his lifetime of work with the freshwater turtles of Australia.〔Beolens B, Watkins M, Grayson M. 2011. ''The Eponym Dictionary of Reptiles''. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN 978-1-4214-0135-5. (''Chelodina canni'', p. 47).〕 ''Taxonomic History''- For many years this species was considered to be a secondary and disjunct population of ''Chelodina novaeguineae'' Boulenger, 1888.〔Boulenger GA. 1888. On the chelydoid chelonians of New Guinea. ''Annali Museo Civico di Storia Naturale di Genova''. (2) 6: 449-452.〕 In recent years many started to believe that this was not the case. An attempt to describe it as ''Chelodina rankini'' was made by Wells and Wellington (1985)〔Wells R, Wellington R. 1985. A classification of the Amphibia and Reptilia of Australia. ''Australian Journal of Herpetology, Supplementary Series'' 1: 1-61.〕 however this was shown to be a ''nomen nudem'' by Iverson et al., 2001,〔Iverson J, Thomson S, Georges A. 2001. Validity of the taxonomic changes for turtles proposed by Wells and Wellington. ''Journal of Herpetology'' 35: 365-368.〕 the species was finally described by William McCord and Scott Thomson in 2002. Subfamilies were resurrected for this family after it was discovered that the South American and Australian members are reciprocally monophyletic, that is they each have their nearest relatives within the continent (Georges et al., 1998).〔Georges A, Birrell J, Saint K, McCord WP, Donnellan S. 1998. A phylogeny for side-necked turtles (Chelonia: Pleurodira) based on mitochondrial and nuclear gene sequences. ''Biological Journal of the Linnean Society'' 67: 213-246.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chelodina canni」の詳細全文を読む スポンサード リンク
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