Karyotypic and evolutionary relationships of the yellowstone salmo clarki bouvieri and west slope salmo clarki lewisi cutthroat trout
Loudenslager, E.J.; Thorgaard, G.H.
Journal of the Fisheries Research Board of Canada 36(6): 630-635
Yellowstone cutthroat trout (S. c. bouvieri) have 64 chromosomes, without any subtelocentric chromosomes and west-slope cutthroat trout (S. c. lewisi) have 66 chromosomes, including 12 subtelocentrics. Both subspecies have 104 chromosome arms. Chromosomal similarities are apparent between the Yellowstone cutthroat and Great Basin cutthroat subspecies and between west-slope cutthroat trout and coastal cutthroat trout. At least 2 distinct evolutionary lines of cutthroat trout are present in the northern Rocky Mountain region.