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Indochinese black langur : ウィキペディア英語版 | Indochinese black langur
The Indochinese black langur (''Trachypithecus ebenus'') is a poorly known lutung native to Laos and adjacent Vietnam. It was originally described as a subspecies of ''T. auratus'', but was later found to be a member of the ''T. francoisi'' group, with some maintaining it as a subspecies of that species.〔 In 2001, it was recommended treating it as a separate species.〔 Except for its almost entirely black pelage, it resembles the other members of the ''T. francoisi'' group. Uniquely in this group, it and the related ''T. hatinhensis'' appear to be parapatric,〔 ''T. ebenus'' showing what appears to be signs of intergradation with ''T. hatinhensis'' are known,〔Duckworth, J. W., Salter, R. E., and Khounboline, K. (eds). ''1999 Wildlife in Lao P.D.R: 1999 status report.'' Vientiane: IUCN, WCS and CPAWM.〕 and genetically the two barely are separable.〔Roos, C. 2004. ''Molecular evolution and systematics of Vietnamese primates.'' In: Nadler, T., U. Streicher, and Ha Thang Long (eds). Conservation of Primates in Vietnam: 23-28.〕〔Roos, C., T. Nadler, Y. P. Zhang, H. Zischler. 2001. ''Molecular evolution and distribution of the superspecies Trachypithecus ().'' Folia Primatol. 72: 181-182.〕 This has led to suggestions that it may be a black morph of that taxon,〔(black langur (Trachypithecus ebenus). ) EPRC. Accessed 2008-07-21〕 which in turn possibly should be considered a subspecies of ''T. laotum''.〔〔 A survey that included 67 ''T. hatinhensis'' revealed a high level of variation in the amount of white to the head, and ''ebenus'' was maintained as a morph.〔Nadler, T. (2010). ''Color variation in Hatinh langurs (Trachypithecus () hatinhensis).'' Vietnamese Journal of Primatology 4: 13-18.〕 It was formerly considered data deficient by IUCN, but they now include it in the endangered ''T. hatinhensis''. ==References==
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