gagei, Ichthyomyzon Hubbs [C. L.] & Trautman [M. B.] 1937:80, Pls. 1 (fig. E), 2 (fig. F) [Miscellaneous Publications, Museum of Zoology, University of Michigan No. 35; ref. 11704] Stream 1/4 mile south of Dry Prong, Grant Parish, presumably a secondary tributary of Little River, Louisiana, U.S.A. Holotype: UMMZ 107042. Paratypes: UMMZ 64494 (3), 107043 (6); USNM 92300 (1). •Valid as Ichthyomyzon gagei Hubbs & Trautman 1937 -- (Lee et al. 1980:18 [ref. 22416], Robison & Buchanan 1988:72 [ref. 23393], Page & Burr 1991:17 [ref. 18983], Boschung 1992:18 [ref. 23239], Etnier & Starnes 1993:92 [ref. 22809], Beamish et al. 1994:718 [ref. 22425], Warren et al. 1994:132 [ref. 25557], Knight & Hastings 1994:149 [ref. 25560], Mettee et al. 1996:67 [ref. 25836], Yamazaki & Goto 2000:8 [ref. 24514], Ross et al. 2001:66 [ref. 25978], Nelson et al. 2004:48 [ref. 27807], Miller & Robison 2004:46 [ref. 27931], Boschung & Mayden 2004:90 [ref. 27995], Scharpf 2005:4 [ref. 28940], Lang et al. 2009:48 [ref. 31599], Page & Burr 2011:123 [ref. 31215], Renaud 2011:50 [ref. 31770], Page et al. 2013:48 [ref. 32708], Robins et al. 2018:35 [ref. 35886], Bagley et al. 2023:311 [ref. 41241], McAllister et al. 2023:62 [ref. 41452], Page et al. 2023:36 [ref. 40505]). Current status: Valid as Ichthyomyzon gagei Hubbs & Trautman 1937. Petromyzontidae. Distribution: North America: eastern-central and northern-central U.S.A. Habitat: freshwater.