. Bulletin of the British Museum (Natural History) Zoology. MONGOLIAN FISHES 195. Fig. 15 Oreoleuciscuspotanini 'Dwarf Form', lateral view (65 & 52 mm SL; BMNH : 1048-1053). species ( Oreoleuciscus potanini and Oreoleusicus pewzowi: Vasil'eva, 1982 & 1985; with judgement being reserved until further analysis of the possibility of a third Oreoleuciscus humilis: after Berg, 1948 and Dashadorzh et al., 1969), or a single polymorphic species ( Oreoleuciscus potanini: Jorgansen, 1940; Kafanova, 1961; Svetovidova, 1965; Gun- drizer, 1976; Dgebuadze & Ryadov, 1978; D
. Bulletin of the British Museum (Natural History) Zoology. MONGOLIAN FISHES 195. Fig. 15 Oreoleuciscuspotanini 'Dwarf Form', lateral view (65 & 52 mm SL; BMNH : 1048-1053). species ( Oreoleuciscus potanini and Oreoleusicus pewzowi: Vasil'eva, 1982 & 1985; with judgement being reserved until further analysis of the possibility of a third Oreoleuciscus humilis: after Berg, 1948 and Dashadorzh et al., 1969), or a single polymorphic species ( Oreoleuciscus potanini: Jorgansen, 1940; Kafanova, 1961; Svetovidova, 1965; Gun- drizer, 1976; Dgebuadze & Ryadov, 1978; Dgebuadze, Ermuhin, Lapin, Ryabov & Trophimenko, 1979; Borisovets etal., 1984 & 1985; Shatunovskii, 1983 & 1985). 'Ichthyophagous', 'phytophagous', 'sharp-snouted' and 'dwarf forms' of the polymorphic Oreoleuciscus potanini were described by Shatunovskii (1983), who considered them to occur throughout the water bodies of the Central Asian basin. Borisovets et al. (1985) added a 'lake form'. It is confined, together with the 'dwarf form', to the isolated water bodies of the Gobi Valley ( Dolin and Hangiyn systems, see Dgebuadze, 1986, and above), whilst the other forms ( 'ichthyophagus', 'phytophagous' and 'sharp-snouted') are restricted to the water bodies of the Great Lakes Valley ( Kbodo and Dzavkhan River systems: Borisovets et al., 1985; Shatunovskii, 1985; and see above p. 194). The two distinct Oreoleuciscus species recognised by Vasil'eva (1985) were '... clearly differentiated' on the basis of only a single character: fusion or segmentation and branch- ing of anterior dorsal fin rays (Vasil'eva, 1985: 31, fig. 2). Analysis of this feature among my specimens from the confined population of Boon Tsagaan Nuur, revealed it to be ontogeneti- cally variable; this seriously diminishes its diagnostic value. The fishes of Boon Tsagaan Nuur were originally identified by Dashdorzh et al. (1969) as Oreoleuciscus pewzowi. The morphological variability of the s
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