regius, Hybognathus Girard [C. F.] 1856:209 [45] [Proceedings of the Academy of Natural Sciences of Philadelphia v. 8; ref. 1810] Potomac River and probably all fresh waters of Maryland, U.S.A. Syntypes: UMMZ 56285 [ex USNM 11] (1); USNM 10 (orig. 4, now 0, 1 pair pharyngeal arches as #2631), 11 (orig. 8, now 0, 1 pair pharyngeal arches as #2632). Type catalog: Gilbert 1998:140 [ref. 23395]. On p. 45 of separate. •Status uncertain -- (Lee et al. 1980:177, 179 [ref. 22416]). •Synonym of Hybognathus nuchalis Agassiz 1855, but a valid subspecies -- (Scott & Crossman 1998:417 [ref. 24570]). •Valid as Hybognathus regius Girard 1856 -- (Smith 1986:163 [ref. 22186], McAllister 1990:59 [ref. 14674], Page & Burr 1991:108 [ref. 18983], Jenkins & Burkhead 1994:446 [ref. 21581], Schmidt 1994:622 [ref. 22424], Stauffer et al. 1995:88 [ref. 23376], Bestgen & Propst 1996:51 [ref. 22399], Murdy et al. 1997:87 [ref. 23144], Gilbert 1998:140 [ref. 23395], Mandrak & Ramshaw 1998:141 [ref. 24999], Houston 1998:147 [ref. 25000], Fuller et al. 1999:79 [ref. 25838], Nelson et al. 2004:71 [ref. 27807], Scharpf 2005:20 [ref. 28940], Page & Burr 2011:218 [ref. 31215], Page et al. 2013:71 [ref. 32708], Page et al. 2023:71 [ref. 40505]). Current status: Valid as Hybognathus regius Girard 1856. Leuciscidae: Pogonichthyinae. Distribution: Eastern North America: Atlantic slope (U.S.A. and Canada). Habitat: freshwater.