derjugini, Alburnus chalcoides var. Berg [L. S.] 1923:272, 507 [ ref. 16807] River Çoruh basin, south Caucasus, Georgia. No types known. Appeared in footnote as Alburnus chalcoides derjugini, and in text on p. 507 as Alburnus alburnus derjugini (manually corrected by L. S. Berg into A. chalcoides derjugini in ZIN library copy). •Synonym of Chalcalburnus chalcoides (Güldenstädt 1772), but a valid subspecies as described -- (Berg 1949:740 [ref. 20661], Lelek 1987:175 [ref. 22962], Ninua & Japoshvili 2008:166 [ref. 31251]). •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) -- (Parin et al. 2014:68 [ref. 33547] dated 1837). •Valid as Alburnus derjugini Berg 1923 -- (Freyhof & Kottelat 2007:205 [ref. 29339], Özuluğ & Freyhof 2007:241 [ref. 29341], Çiçek et al. 2015:146 [ref. 35151], Bogutskaya et al. 2017:93 [ref. 35513], Saygun et al. 2017:187 [ref. 38891], Freyhof et al. 2018:130 [ref. 35889], Özuluğ et al. 2018:37 [ref. 35953], Çiçek et al. 2020:250 [ref. 37644], Kuljanishvili et al. 2020:[5] [ref. 37535], Yogurtçuoglu et al. 2020:[11] [ref. 37627], Çiçek et al. 2023:390 [ref. 40625], Dyldin et al. 2023:[29] [ref. 40328] with question, Çiçek et al. 2024:215 [ref. 40789]). Current status: Valid as Alburnus derjugini Berg 1923. Leuciscidae: Leuciscinae. Distribution: Eurasia: streams of eastern Black Sea basin, from Ashe drainage (Russia) to River Harsit (northeastern Turkey). Habitat: freshwater.