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keeled box turtle
The keeled box turtle (''Cuora mouhotii'' syn. ''Pyxidea mouhotii'') is a species of turtle in the family Geoemydidae. It is native to Asia, where it occurs in China, India, Laos, Burma, Vietnam,〔Asian Turtle Trade Working Group. 2000. (''Cuora mouhotii''. ) In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.1. Downloaded on 20 October 2013.〕 Thailand, and Bhutan.〔(''Cuora mouhotii''. ) The Reptile Database.〕 Other common names include keel-backed terrapin and jagged-shelled turtle.〔
==Taxonomy==
This turtle is sometimes treated as the sole species of the monotypic genus ''Pyxidea''.〔〔(''Pyxidea mouhotii''. ) Integrated Taxonomic Information System (ITIS).〕〔Zhang, L., et al. (2008). (The complete mitochondrial genome of the keeled box turtle ''Pyxidea mouhotii'' and phylogenetic analysis of major turtle groups. ) ''Journal of Genetics and Genomics'' 35(1), 33-40.〕 Phylogenetic analysis using mitochondrial DNA has provided evidence that the species is part of the "''Cuora'' group", a monophyletic group of Asian box turtles, and the name ''Pyxidea'' should probably be synonymized with ''Cuora'', making the keeled box turtle part of that genus.〔Honda, M., et al. (2002). (Phylogenetic relationships of the Asian box turtles of the genus ''Cuora sensu lato'' (Reptilia: Bataguridae) inferred from mitochondrial DNA sequences. ) ''Zoological Science'' 19, 1305-12.〕 Other phylogenetic studies of ''Cuora'' support this conclusion.〔Stuart, B. L. and J. F. Parham. (2004). (Molecular phylogeny of the critically endangered Indochinese box turtle (''Cuora galbinifrons''). ) ''Molecular Phylogenetics and Evolution'' 31(1), 164-77.〕 In addition, its morphology is not distinct enough from that of ''Cuora'' species to keep it separate, and it is known to hybridize with ''Cuora galbinifrons''.〔
There are two subspecies, ''C. m. mouhotii'' and ''C. m. obsti''.〔〔〔Fritz, U., et al. (1998). Eine neue Unterart der Dreikiel-Scharnierschildkröte, ''Pyxidea mouhotii'' (Gray, 1862). ''Zool. Abh. Mus. Tierkd. Dresden'' 50, 33-43〕
The Southern Vietnamese population of ''Cuora mouhotii'' lives alongside ''Cuora picturata''. Since ''Cuora mouhotii'' is known to hybridize with the closest living relatives of ''Cuora picturata'' (''Cuora galbinifrons'' and ''Cuora bourreti'') there is a possibility of hybridization in the wild between these two populations.〔Ly, Tri, Huy Duc Hoang, and Bryan L. Stewart. "Occurrence of the endangered keeled box turtle, Cuora mouhotii, in Southern Vietnam." bioone.org. N.p., n.d. Web. 23 Oct. 2013. .〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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