albidus, Ptychostomus Girard [C. F.] 1856:172 [8] [Proceedings of the Academy of Natural Sciences of Philadelphia v. 8; ref. 1810] Near Monterey, Nuevo León, Mexico. Lectotype: USNM 170 (poor condition). Paralectotypes: USNM 164524 [ex USNM 170] (1). Type catalog: Gilbert 1998:170 [ref. 23395]. On p. 8 of separate. Lectotype selected by Robins & Raney 1957:300 [ref. 12166]. •Synonym of Moxostoma congestum (Baird & Girard 1854) -- (Lee et al. 1980:418 [ref. 22416]). •Synonym of Scartomyzon congestus (Baird & Girard 1856) but a valid subspecies -- (Gilbert 1998:170 [ref. 23395]). •Valid as Moxostoma albidum (Girard 1856) -- (Nelson et al. 2004:79 [ref. 27807], Scharpf 2006:10 [ref. 30386], Page et al. 2013:80 [ref. 32708], Pérez-Rodríguez et al. 2016:[3] 635 [ref. 37366], Page et al. 2023:64 [ref. 40505]). Current status: Valid as Moxostoma albidum (Girard 1856). Catostomidae: Catostominae. Distribution: Southern North America: Rio Grande tributaries (northeastern Mexico). Habitat: freshwater.