Tylognathus is an invalid genus of ray-finned fishes in the family Cyprinidae. It was established by Heckel in 1843 without a type species. Varicorhinus diplostomus, described by Heckel in 1838 and erroneously redescribed by the same author in 1844 as T. valenciennesii, was later designated the type species. Today this fish is placed in the genus Bangana.
The members of this polyphyletic assemblage mainly belong to the group which is known as the subfamily Labeoninae to some authors and the tribe Labeonini of subfamily Cyprininae by others.
The 34 taxa formerly placed in Tylognathus are:
Tylognathus ariza (Hamilton, 1807) is now Bangana arizaTylognathus barbatulus Heckel, 1844 is now Crossocheilus diplochilusTylognathus bo Popta, 1904 is now Lobocheilos boTylognathus boides Popta, 1906 is now Lobocheilos boTylognathus brunneus Fowler, 1934 is now Henicorhynchus siamensisTylognathus cantini Sauvage, 1882 is now Labeo cylindricusTylognathus caudimaculatus Fowler, 1934 is now Cirrhinus caudimaculatusTylognathus coatesi Fowler, 1937 is now Crossocheilus reticulatusTylognathus davidi Sauvage, 1878 is now Sarcocheilichthys davidiTylognathus davisi Fowler, 1937 is now Lobocheilos davisiTylognathus delacouri Pellegrin & Fang, 1940 is now Lobocheilos delacouriTylognathus elegans Günther, 1868 is now Hemigrammocapoeta elegansTylognathus falcifer (Valenciennes, 1842) is now Lobocheilos falciferTylognathus fowleri Pellegrin & Chevey, 1936 is now Lobocheilos fowleriTylognathus gedrosicus (Zugmayer, 1912) is now Labeo gedrosicusTylognathus gracilis Fowler, 1937 is now Lobocheilos gracilisTylognathus heterorhynchus (Bleeker, 1853) is now Schismatorhynchos heterorhynchosTylognathus hispidus (Valenciennes, 1842) is now Lobocheilos falciferTylognathus kajanensis Popta, 1904 is now Lobocheilos kajanensisTylognathus klatti is now Crossocheilus klatti or part of HemigrammocapoetaTylognathus lehat (Bleeker, 1858) is now Lobocheilos lehatTylognathus melanotaenia Fowler, 1935 is now Lobocheilos melanotaeniaTylognathus montanus Günther, 1889 is now Labeo cylindricusTylognathus nanus is now Hemigrammocapoeta nanaTylognathus porcellus Heckel, 1844 is now Labeo porcellusTylognathus quadrilineatus Fowler, 1935 is now Lobocheilos quadrilineatusTylognathus rhabdoura Fowler, 1934 is now Lobocheilos rhabdouraTylognathus schwanenfeldii (Bleeker, 1853) is now Lobocheilos schwanenfeldiiTylognathus siamensis de Beaufort, 1927 is now Henicorhynchus siamensisTylognathus sinensis Kner, 1867 is now Abbottina rivularisTylognathus steinitziorum is now Hemigrammocapoeta nanaTylognathus striolatus Günther, 1868 is now Labeo boggutTylognathus trangensis Fowler, 1939 is now Lobocheilos trangensisTylognathus valenciennesii Heckel, 1844 is now Bangana diplostoma