siderius, Hyborhynchus Cope [E. D.] in Cope & Yarrow 1875:670, Pl. 31 (figs. 6-6a) [Engineer Department, United States Army, Report upon the Geographical and Geological Explorations and Surveys west of the one hundredth Meridian v. 5 (Zoology) Chapter 6; ref. 968] Camp Lowell [Fort Lowell, now in Tucson], on lower part of Cienega Creek, Pima County, Arizona, U.S.A. Syntypes: MCZ 36247 [ex USNM 16984] (4), USNM 16984 (37). Type catalog: Gilbert 1998:147 [ref. 23395]. •Synonym of Rhinichthys chrysogaster (Girard 1856) -- (Gilbert 1998:147 [ref. 23395]). •Synonym of Agosia chrysogaster Girard 1856 -- (Minckley & Marsh 2009:112 [ref. 31114]). Current status: Synonym of Agosia chrysogaster Girard 1856. Leuciscidae: Pogonichthyinae. Habitat: freshwater.