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Babka gymnotrachelus : ウィキペディア英語版
Racer goby

''Babka gymnotrachelus'', the racer goby, is a species of goby native to fresh, sometimes brackish, waters, of the Black Sea basin. It is a Ponto-Caspian relict species. The species is related to a monotypic genus ''Babka'', which was considered as subgenus of ''Neogobius'' genus earlier, but now it is erected based on the molecular analysis.〔Stepien C.A., Tumeo M.A. (2006): Invasion genetics of Ponto-Caspian gobies in the Great Lakes: a "cryptic" species, absence of founder effects, and comparative risk analysis. Biological Invasions, 8: 61–78.()〕〔Neilson M.E., Stepien C.A. (2009) Escape from the Ponto-Caspian: Evolution and biogeography of an endemic goby species flock (Benthophilinae: Gobiidae: Teleostei). Molecular Phylogenetics and Evolution, 52(1): 84-102. 〕
==Characteristics==

It has 7–8 dorsal spines, 14–18 dorsal soft rays, a single anal spine and 12–16 anal soft rays.
This species is distinguished from its congeners by the multiple characteristics. It has diagonal bars of irregular position and shape. The first branched ray of second dorsal is about as long as its penultimate ray. It lacks scales on midline of nape, anterior to its preoperculum. It has a pelvic-disc fraenum with small rounded lobes and length less than 1/6 of width at base. It has 54–62 + 2–3 scales in midlateral series. The posterior part of first dorsal has no black spot.

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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