ukpam, Hemitrygon Smith [J. A.] 1863:69 [Proceedings of the Royal Physical Society of Edinburgh v. 2 (1859); ref. 18724] Old Calabar River, West Africa. Syntypes: BMNH 1874.5.23.1 (1), Royal Scot. Mus. Edinb. (1). •Valid as Dasyatis ukpam (Smith 1863) -- (Compagno & Roberts 1984:5 [ref. 6167], Compagno & Roberts 1984:295 [ref. 8237], Capapé & Desoutter 1990:62 [ref. 19317], Séret in Lévêque et al. 1990:70 [ref. 21589], Taniuchi 1991:97 [ref. 21657], Santos & Carvalho 2004:16 [ref. 28040], Carvalho et al. 2007:159 [ref. 30012], Séret 2016:1415 [ref. 34545]). •Valid as Urogymnus ukpan (Smith 1863) -- (Compagno 1999:497 [ref. 25589], Weigmann 2016:141 [ref. 34211]). •Valid as Fontitrygon ukpam (Smith 1863) -- (Last et al. 2016:361 [ref. 34581], Last et al. 2016:550 [ref. 35010], Fermon et al. 2022:108 [ref. 39448]). Current status: Valid as Fontitrygon ukpam (Smith 1863). Dasyatidae: Urogymninae. Distribution: Eastern Atlantic: Gabon, Nigeria and Congo. Habitat: freshwater.