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Northern rock sole
The Northern rock sole, ''Lepidopsetta polyxystra'', is a flatfish of the family Pleuronectidae. It is a demersal fish that lives on sand, mud and gravel bottoms at depths of up to , though it is most commonly found between . Its native habitat is the temperate waters of the northern Pacific, from Puget Sound to Alaska (overlapping the range of the rock sole), the Aleutian Islands and across the Bering Sea to the Kuril Islands and the Sea of Okhotsk (overlapping the range of the dusky sole). Males grow up to in length, whilst females can reach . The maximum recorded lifespan is 18 years.
==Taxonomy and nomenclature==
Prior to 2000 the Northern rock sole and the rock sole, ''Lepidopsetta bilineata'', were considered to be a single species under the genus ''Lepidopsetta'', but work by Orr & Matarese published in 2000 reorganised the genus into three separate taxa.
As a result of this reclassification and renaming, the rock sole ''L. bilineata'' may be referred to as the "southern" rock sole, in order to avoid confusion with the Northern rock sole ''L. polyxystra''.
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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