longipinnis, Rhinogobius Nguyen [V. H.] & Vo [V. B.] in Nguyen 2006:636, Fig. 6 [Freshwater fishes of Vietnam v. 3; ref. 29809] Pho Day River, Thon Hop Hoa community, Son Durong district, Thai Nguyen Province, Vietnam [Nui Coc Lake, Dai Tu District, Thai Nguyen Province, Vietnam]. Neotype: ANSP 210043. Original types: RIA1 (lost) [ex NCNTTS I Inst., Bac Ninh.], RIA1 (7, lost). Neotype designated by Endruweit 2024:156 [ref. 41040]. •Inquirenda as Rhinogobius longipinnis Nguyen & Vo 2006 -- (Kottelat 2013:424 [ref. 32989]). •Valid as Rhinogobius longipinnis Nguyen & Vo 2006 -- (Takahashi & Okazaki 2017:[3] [ref. 35171], Endruweit 2024:153 [ref. 41040]). •Synonym of Rhinogobius similis Gill 1859 -- (Suzuki et al. 2015:[4] [ref. 33993] with question, Suzuki et al. 2017:83 [ref. 35202], Maeda et al. 2024:532 [ref. 41367]). Current status: Uncertain as Rhinogobius longipinnis Nguyen & Vo 2006. Oxudercidae: Gobionellinae. Distribution: Southeast Asia: Lo River drainage at Tuyen Quang City and rivers from Lake Nui Coc, Red River basin, northern and central Vietnam [if valid]. Habitat: freshwater.