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METHODS In the years since publication of the first edition of this guide (Snyder and Muth 1990), corrections have been noted, character-range extensions recorded for most described species, and better drawings for two larval stages of white sucker (Snyder 1998) became available. These reVISIOns, descriptive information for longnose sucker, and a computer-interactive key to UCRB catostomids were documented by Snyder (2003) and have been incorporated in this updated and expanded edition of the guide. Specimens Examined Cultured specimens were analyzed for each species. Developmental series for all but Utah sucker were reared by the LFL from artificially fertilized eggs of Colorado origin during 1978 through 1981 and 2001. Parental stock for culture of razorback sucker was collected from a gravel pit off the Colorado River near Clifton; flannelmouth sucker from the Yampa River near Juniper Springs; bluehead sucker from the White River near Rio Blanco Lake; mountain sucker from Willow Creek, a headwater tribu- tary of the Elk River northwest of Steamboat Springs; white sucker from a private pond southwest of Fort Collins; and longnose sucker from Parvin Lake, Larimer County, and Upper Big Creek Lake, Jackson County. Razorback sucker larvae and juveniles were reared also by Dexter National Fish Hatchery, New Mexico, in 1982 from Lake Mohave stock in Arizona. Utah sucker specimens were reared by the Utah Cooperative Fish and Wildlife Research Unit in 1987 from Bear Lake stock. Wild or field-collected larvae and juveniles of positive identity for all species, except Utah sucker, also were analyzed. These included: razorback sucker collected from Arizona's Lake Mohave, probably in the early 1980's, and Salt River, at Horseshoe Bend in 1984 (the latter specimens were reared at Dexter National Fish Hatchery and stocked a week prior to capture on March 20); flannelmouth, bluehead, and white sucker larvae and juveniles from Colorado's Yampa River west of Milner to the Lily Park area below Cross Mountain Canyon in 1976 through 1979; flannelmouth and bluehead suckers from Colorado's White River between Rio Blanco Lake and Spring Creek in 1976 through 1979, with cursorily examined speci- mens from Colorado's Colorado River between Palisade and the Utah border and Colorado's Gunnison River between Whitewater and Redlands Dam in 1977 through 1979; mountain sucker from Colorado's Willow Creek (and Ways Gulch, Routt County) in 1981 and Utah's Provo and Spanish Fork Rivers in 1982 through 1986, with cursorily examined specimens from Nevada's Truckee River and Pyramid Lake in 1973 through 1982 and Montana's Rocky Creek, Madison River, and Flathead Creek (tributaries of the Missouri River) in 1966 and 1967; and longnose sucker from Colorado's Gunnison River between Peeples and Escalante (Delta County) in 1993 and 1995. Most specimens were killed and fixed in 10% formalin, then stored in marble-chip- or phosphate-buffered 3% formalin. Some long- nose sucker reared by LFL in 2001 were preserved and stored directly in 95 to 100% ethanol. Some mountain sucker specimens from the Truckee River in Nevada were fIxed in formalin then stored in 50% isopropanol. Some additional specimens were stored in alcohol (70% or 95% ethanol or 50% isopropanol), prior to clearing and staining for skeletal study. Due to excessive dehydration and shrinkage, none of the alcohol-stored specimens were analyzed for morphometrics or size relative to developmental state. Most specimens analyzed or otherwise examined for descriptions are maintained as part of the LFL Collection and are available for examination. Some specimens were lost or inadequately labeled (e.g., only external labels which lost adhesion) prior to cataloging. De- scriptive data (e.g., counts and measures) for each analyzed specimen are stored in computer spreadsheet files, also maintained by LFL, and can be linked with individually cataloged "full- analysis" specimens, including those used for drawings. Catalog numbers for all available study specimens are as follows: 16