signifer, Himantura Compagno [L. J. V.] & Roberts [T. R.] 1982:333, Figs. 1A, 4, 7A, 8, 9A-C, 10 [Environmental Biology of Fishes v. 7 (no. 4); ref. 8489] Mouth of Sugnai Ketunggau near mainstream of Kapuas River, Kalimantan Barat, Indonesia. Holotype: MZB 3004. Paratypes: BMNH 1981.11.16.1 (1), CAS 48777 (1, dissected), MNHN 1981-1342 (1), MZB 3005 (1), RMNH 28800 (1), USNM 229492 (1). Type catalog: Séret & McEachran 1987:18 [ref. 9312]. •Valid as Himantura signifer Compagno & Roberts 1982 -- (Roberts 1989:23 [ref. 6439], Monkolprasit & Roberts 1990:204 [ref. 20065], Kottelat et al. 1993:2 [ref. 23448], Rainboth 1996:54 [ref. 22772], Tan & Lim 1998:428 [ref. 23648], Last & Compagno 1999:1503 [ref. 24639], Compagno 1999:496 [ref. 25589], Kottelat & Widjanarti 2005:144 [ref. 28284], Vidthayanon & Roberts 2006:124 [ref. 28695], Schwartz 2008:38 [ref. 36773], Last el al. 2010:210 [ref. 32461], Kottelat 2013:26 [ref. 32989], Weigmann 2016:137 [ref. 34211]). •Valid as Fluvitrygon signifer (Compagno & Roberts 1982) -- (Last et al. 2016:360 [ref. 34581], Last et al. 2016:544 [ref. 35010], Iqbal et al. 2017:84 [ref. 35489], Iqbal et al. 2018:171 [ref. 35761], Ng et al. 2019:518 [ref. 36606], Taki et al. 2021:38 [ref. 39830]). Current status: Valid as Fluvitrygon signifer (Compagno & Roberts 1982). Dasyatidae: Urogymninae. Distribution: Thailand, Indonesia, Malaysia, Sumatra and Borneo. Habitat: freshwater, brackish.