Squalius

Squalius is a genus of fish in the family Cyprinidae found in Europe and Asia. Hybridization is not rare in the Cyprinidae, including this genus. S. alburnoides is known to be of ancient hybrid origin, with the paternal lineage deriving from a prehistoric species related to Anaecypris; the latter mated with ancestral S. pyrenaicus. Present-day S. alburnoides mates with sympatric congeners of other species.

Species
There are currently 52 recognized species in this genus:
 * Squalius adanaensis Turan, Kottelat & Doğan, 2013 (Adana chub)
 * Squalius agdamicus S. N. Kamensky, 1901
 * Squalius alburnoides (Steindachner, 1866)
 * Squalius albus (Bonaparte, 1838)
 * Squalius anatolicus (Bogutskaya, 1997) (Beyşehir chub)
 * Squalius aphipsi (A. I. Aleksandrov, 1927) (Aphips chub)
 * Squalius aradensis (Coelho, Bogutskaya, Rodrigues & Collares-Pereira, 1998)
 * Squalius aristotelis Özuluğ & Freyhof, 2011 (Tuzla chub)
 * Squalius berak Heckel, 1843 (Mesopotamian chub)
 * Squalius cappadocicus Özuluğ & Freyhof, 2011 (Cappadocian chub)
 * Squalius carinus Özuluğ & Freyhof, 2011 (Chocolate chub)
 * Squalius carolitertii (Doadrio, 1988)
 * Squalius castellanus Doadrio, Perea & F. M. Alonso, 2007
 * Squalius cephaloides (Battalgil, 1942) (Thick-lipped chub)
 * Squalius cephalus (Linnaeus, 1758) (Common chub)
 * Squalius cii (J. Richardson, 1857)
 * Squalius fellowesii (Günther, 1868) (Aegean chub)
 * Squalius ghigii (Gianferrari, 1927) (Rhodes minnow)
 * Squalius illyricus Heckel & Kner, 1857
 * Squalius janae Bogutskaya & Zupančič, 2010
 * Squalius keadicus (Stephanidis, 1971)
 * Squalius kosswigi (M. S. Karaman (sr), 1972)
 * Squalius kottelati Turan, Yılmaz & Kaya, 2009
 * Squalius laietanus Doadrio, Kottelat & de Sostoa, 2007
 * Squalius lepidus Heckel, 1843
 * Squalius lucumonis (Bianco, 1983)
 * Squalius malacitanus Doadrio & Carmona, 2006 (Málaga chub)
 * Squalius microlepis Heckel, 1843
 * Squalius moreoticus (Stephanidis, 1971) (Stymphalia chub)
 * Squalius namak Khaefi, Esmaeili, Sayyadzadeh, Geiger & Freyhof, 2016
 * Squalius orientalis (Nordmann, 1840)
 * Squalius orpheus Kottelat & Economidis, 2006 (Orpheus chub)
 * Squalius palaciosi (Doadrio, 1980) (Jándula chub)
 * Squalius pamvoticus (Stephanidis, 1939) (Pamvotis chub)
 * Squalius peloponensis (Valenciennes, 1844) (Peloponnese chub)
 * Squalius platyceps Zupančič, Marić, Naseka & Bogutskaya, 2010
 * Squalius prespensis (Fowler, 1977)
 * Squalius pursakensis (Hankó (hu), 1925) (Sakarya chub)
 * Squalius pyrenaicus (Günther, 1868)
 * Squalius recurvirostris Özuluğ & Freyhof, 2011 (Akşehir chub)
 * Squalius seyhanensis Turan, Kottelat & Doğan, 2013 (Seyhan chub)
 * Squalius spurius Heckel, 1843 (Orontes chub)
 * Squalius squaliusculus Kessler, 1872 (Syr-Darya dace)
 * Squalius squalus (Bonaparte, 1837)
 * Squalius svallize Heckel & Kner, 1857
 * Squalius tenellus Heckel, 1843
 * Squalius torgalensis (Coelho, Bogutskaya, Rodrigues & Collares-Pereira, 1998)
 * Squalius turcicus De Filippi, 1865 (Transcaucasian chub)
 * Squalius ulanus Günther, 1899
 * Squalius valentinus Doadrio & Carmona, 2006 (Valencia chub)
 * Squalius vardarensis S. L. Karaman, 1928
 * Squalius zrmanjae S. L. Karaman, 1928