longipenis, Gunterichthys Dawson [C. E.] 1966:206, Figs. 1-3 [Proceedings of the Biological Society of Washington v. 79; ref. 1063] North shore of Davis Bayou, off Mississippi Sound, Gulf of Mexico. Holotype: USNM 199431. Paratypes: GCRL V64:1046 (1), V64:1048 (1, head and anterior body, c&s), V66:1527 (1); USNM 199430 (1), 199757 (2). •Valid as Gunterichthys longipenis Dawson 1966 -- (Cohen & Nielsen 1978:59 [ref. 881], Robins & Ray 1986:97 [ref. 23100], Tolley & Peebles 1987:43 [ref. 39769], Boschung 1992:77 [ref. 23239], McEachran & Fechhelm 1998:745 [ref. 23897], Nielsen & Cohen in Nielsen et al. 1999:133 [ref. 24448], Nielsen 2003:974 [ref. 27009], Møller et al. 2004:159 [ref. 27770], Nelson et al. 2004:92 [ref. 27807], Garrido-Linares & Acero P. 2006:290 [ref. 28946], Page et al. 2013:95 [ref. 32708], Møller et al. 2016:Appendix B [ref. 34432] in Dinematichthyidae, Page et al. 2023:111 [ref. 40505]). Current status: Valid as Gunterichthys longipenis Dawson 1966. Dinematichthyidae. Distribution: Western Atlantic: including Gulf of Mexico. Habitat: brackish, marine.