| Abstract | Three spp. of Moxostoma congestum, austrinum and mascotae, occur in Texas, New Mexico and Mexico. They are described in detail, their morphological variation noted and their distribution and relationships discussed. All belong to the subgenus Scartomyzon of which robustum of s.-e. United States is most closely related. A n. ssp. of austrinum is diagnosed and M. albidum is considered a ssp. of congestum M. austrinum and M. mascotae are the only members of the speciose genus, wide ranging in e. N. America, that occur on the Pacific Slope of N. America. They are closely related and apparently resulted from a single transfer of fishes from Atlantic to the Pacific Slope during a past pluvial period. || ABSTRACT AUTHORS: Authors
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