Verification of Identifications of Cyprinid Specimens from the Colorado River Basin, Texas

Numerous published reports indicate that records of occurrence of Sharpnose Shiner, Notropis oxyrhynchus, in the Colorado River basin of Texas are the result of an introduction, though the species is clearly native in the adjacent Brazos River basin. We discovered previously mis-identified specimens of N. oxyrhynchus that extend the record of presence of the species in the Colorado basin much further back in time than previous authors realized, and conclude that the species was almost certainly native there. However, lack of the species in any of the many collections made in the basin over the last half century indicates a low probability that it still persists there.U.S. Fish & Wildlife Service, Arlington, Texas. FWS FBMS Agreement #: F12AP00622; CFDA Number/Title: 15.650; non-Profit, AcademicTexas Natural Science Cente