unicuspis, Ichthyomyzon Hubbs [C. L.] & Trautman [M. B.] 1937:53, Pls. 1 (fig.A), 2 (figs.A, B) [Miscellaneous Publications, Museum of Zoology, University of Michigan No. 35; ref. 11704] Swan Creek, 3 miles above the lower Maumee River, Toledo, Ohio, U.S.A. Holotype: UMMZ 107040. Paratypes: AMNH 1550 (2), 7607 (1); FMNH 6307-09 (1, 1, 2), 6462 (3), 8960 (1); OSM; UMMZ (many); USNM 7442 (disintegrated), 7479 (1), 11060 (1), 12518 (2), 17762 (2), 32663 (1), 63029 (1), 64833 (2), 64915 (8), 65294 (1), 67009 (2), 68725-26 (2, 1), 68914 (1), 78162 (1); UWM; Milwaukee; Ohio. Type catalog: Ibarra & Stewart 1987:49 [ref. 12367]. •Valid as Ichthyomyzon unicuspis Hubbs & Trautman 1937 -- (Lee et al. 1980:20 [ref. 22416], Smith 1986:37 [ref. 22186], McAllister 1990:26 [ref. 14674], Page & Burr 1991:16 [ref. 18983], Etnier & Starnes 1993:94 [ref. 22809], Cochran & Marks 1995:409 [ref. 22409], Stauffer et al. 1995:25 [ref. 23376], Chereshnev 1996:598 [ref. 24659], Scott & Crossman 1998:52 [ref. 24570], Fuller et al. 1999:18 [ref. 25838], Lyons et al. 2000:20 [ref. 26594], Renaud & de Ville 2000:333 [ref. 24887], Yamazaki & Goto 2000:8 [ref. 24514], Ross et al. 2001:67 [ref. 25978], Nelson et al. 2004:48 [ref. 27807], Bailey et al. 2004:58 [ref. 27882], Scharpf 2005:5 [ref. 28940], Lang et al. 2009:48 [ref. 31599], Page & Burr 2011:121 [ref. 31215], Robison et al. 2011:458 [ref. 31590], Renaud 2011:53 [ref. 31770], Page et al. 2013:48 [ref. 32708], Page et al. 2023:36 [ref. 40505]). Current status: Valid as Ichthyomyzon unicuspis Hubbs & Trautman 1937. Petromyzontidae. Distribution: North America: south-central Canada and eastern U.S.A. Habitat: freshwater.