jordani, Leucogobio Ishikawa [C.] 1901:163, Pl. 3 (fig. 2) [Annotationes Zoologicae Japonenses v. 3 (pt 4); ref. 14756] Lake Biwa, western central Honshu, Japan. No types known. •Synonym of Gnathopogon elongatus (Temminck & Schlegel 1846), subspecies coerulescens (Sauvage 1883) -- (Okada 1961:427 [ref. 6363]). •Synonym of Gnathopogon caerulescens (Sauvage 1883) -- (Bănărescu & Nalbant 1967:348 [ref. 20623] as coerulescens). Current status: Synonym of Gnathopogon caerulescens (Sauvage 1883). Gobionidae. Habitat: freshwater.