istanbulensis, Alburnus (Chalcalburnus) chalcoides Battalgil [F.] 1941:180 [Revue de la Faculté des Sciences de l'Université d'Instanbul, Série B: Sciences Naturelles v. 6 (nos 1-2); ref. 13194] Kâathane [Kagithane] stream, draining to Bosphorus River, near Istanbul, Turkey. Syntypes: whereabouts unknown. Özulug & Freyhof 2007:243 [ref. 29341] serve as first revisers, selecting istanbulensis over its synonym spancae -- both species occurring in the same publication •Synonym of Chalcalburnus chalcoides (Güldenstädt 1772) -- (Lelek 1987:175 [ref. 22962]). •Synonym of Chalcalburnus chalcoides (Güldenstädt 1772) -- (Kottelat 1997:53 [ref. 22952]). •Synonym of Alburnus chalcoides (Güldenstädt 1772) -- (Bogutskaya 1997:165 [ref. 23566]). •Synonym of Alburnus mento (Heckel 1836) -- (Mangit & Yerli 2017:1 [ref. 35640] dated 1837). •Valid as Alburnus istanbulensis Battalgil 1941 -- (Freyhof & Kottelat 2007:205 [ref. 29339], Özuluğ & Freyhof 2007:242 [ref. 29341], Kottelat & Freyhof 2007:168 [ref. 29996], Çiçek et al. 2015:146 [ref. 35151], Bogutskaya et al. 2017:99 [ref. 35513], Çiçek et al. 2018:9 [ref. 36267], Freyhof et al. 2018:130 [ref. 35889], Özuluğ & Saç 2019:29 [ref. 36599], Çiçek et al. 2020:251 [ref. 37644], Çiçek et al. 2023:391 [ref. 40625], Çiçek et al. 2024:218 [ref. 40789]). Current status: Valid as Alburnus istanbulensis Battalgil 1941. Leuciscidae: Leuciscinae. Distribution: Asia Minor: Marmara Sea and Black Sea tributaries, coastal streams of eastern Thrace (Turkey). Habitat: freshwater.