sulcatus, Rhinogobius Chen [I-S.] & Kottelat [M.] 2005:1413, Figs. 3, 7, 11 [Journal of Natural History v. 39 (no. 17); ref. 28141] Small coastal stream, at about kilometer 10 on road from Mong Duong to Tien Yen, 21°05'38"N, 107°21'02"E, Cam Pha District, Quang Ninh Province, Vietnam. Holotype: ZRC 49208. Paratypes: CMK 14981 (8), ZRC 49209 (4). •Valid as Rhinogobius sulcatus Chen & Kottelat 2005 -- (Chen et al. 2008:342 [ref. 29895], Kottelat 2013:426 [ref. 32989], Huang et al. 2016:[9] [ref. 34339], Takahashi & Okazaki 2017:[2] [ref. 35171], Suzuki et al. 2017:82 [ref. 35202], Endruweit 2018:307 [ref. 36165]). Current status: Valid as Rhinogobius sulcatus Chen & Kottelat 2005. Gobiidae: Gobionellinae. Distribution: Red River basin, northeast Vietnam. Habitat: freshwater.