tenellus, Squalius Heckel [J. J.] 1843:1042 [52] [Ichthyologie [von Syrien]. In Russegger v. 1 (pt 2); ref. 2066] Livno, Bosnia. Syntypes: NMW 16001-02 (3), 49613 (2). On p. 52 of separate [ref. 2067]. •Synonym of Leuciscus turskyi (Heckel 1843), but a valid subspecies tennellus (Heckel 1843) -- (Mrakovcic et al. 1995:184 [ref. 23079]). •Valid as Squalius tenellus Heckel 1843 -- (Kottelat & Freyhof 2007:275 [ref. 29996], Zupančič 2008:45 [ref. 29926], Bogutskaya & Zupančič 2010:53 [ref. 30905], Perea et al. 2010:13 [ref. 31802], Özuluğ & Freyhof 2011:107 [ref. 31360], Ćaleta et al. 2015:93 [ref. 34877], Bogutskaya et al. 2019:119 [ref. 37207], Buj et al. 2019:[16] [ref. 37174], Ćaleta et al. 2019:168 [ref. 37026]). Current status: Valid as Squalius tenellus Heckel 1843. Leuciscidae: Leuciscinae. Distribution: Southeast Europe: Karstic waters of Livanjsko Polje (Croatia; Bosnia and Herzegovina); introduced elsewhere, Habitat: freshwater.