. Bulletin of the British Museum (Natural History) Zoology. â i â Fig. 9 Brachymystax lenok in lateral view (237 mm SL; BMNH : 3-5).. Fig. 10 Thymallus arcticus, lateral view (165 mm SL; BMNH : 27-28) SALMONIDAE SALMONINAE Brachymystax lenok (Pallas, 1773) Fig. 9 Material. NS 36, : 1-2 (106 & 165 mm); NS 37, : 3-5 (226-237 mm); NS 37, : 6 (408 mm)) NS 38, : 7-8 (236-247 mm); NS 40, : 9 (53 mm); NS 48, : 10-11 (236 & 315 mm); NS 49, : 12-13 (196 & 248 mm); NS 52, : 14 (400 mm). Total 14 specime
. Bulletin of the British Museum (Natural History) Zoology. â i â Fig. 9 Brachymystax lenok in lateral view (237 mm SL; BMNH : 3-5).. Fig. 10 Thymallus arcticus, lateral view (165 mm SL; BMNH : 27-28) SALMONIDAE SALMONINAE Brachymystax lenok (Pallas, 1773) Fig. 9 Material. NS 36, : 1-2 (106 & 165 mm); NS 37, : 3-5 (226-237 mm); NS 37, : 6 (408 mm)) NS 38, : 7-8 (236-247 mm); NS 40, : 9 (53 mm); NS 48, : 10-11 (236 & 315 mm); NS 49, : 12-13 (196 & 248 mm); NS 52, : 14 (400 mm). Total 14 specimens. Variation. Morphometric diagnosis of this monotypic genus given by Berg (1948), Holcfk & Pivnicka (1968: 4) and Shatunovskii (1983 & 1985 see figs. 2 & 3). A prominently pink coloured ventral region present in my specimens was not mentioned in Berg's colour description (1948: 320); maybe it is coloration associated with the breeding cycle. Geographical range. Extends from the Ob River in western Siberia, east to the Amur River and its tributaries in the USSR and North China. Ecological notes. In Mongolia collected from the main stream and side channels of the Terilg Gol (Arctic basin) and Herelen Gol (Pacific basin); a distribution that supports that proposed by Shatunovskii (1983: 114). Taxonomic discussion. A Brachymystax species was re- ported by Mori (1938 and see Berg, 1948: 318) from the Upper Yalu River. I suspect this species in which '... the snout is strongly elongated forming a fleshy cone projecting forward above the lower jaw' (Berg, 1948: 318) is a Rhyncho- cypris (sensu Howes, 1985; see below p. 197) and is not referrable to Brachymystax lenok. The Upper Yalu River forms the natural border between North Korea and China (PRC) and may, historically, or even seasonally, be connected with the Amur River system by southern tributaries of the Sungari River. Brachymystax was caught together with Rhynchocypris during the course of this survey in the Her
Size: 2579px × 969px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollection, bookpublisherlondonbutterworths
