Acheilognathus is a genus of freshwater ray-finned fishes belonging to the family Acheilognathidae, the bitterlings. The fishes in this genus are found in Asia. The name comes from the Ancient Greek ἀ- (á-), meaning "without", χεῖλος (kheîlos), meaning "lip", and γνάθος (gnáthos), meaning "jaw".
Morphology Fish of this genus range in length from 5 to 27 cm. They are similar in appearance to fishes of the genus Puntius.
Species These are the currently recognized species in this genus: Acheilognathus amurensis (Holčík, 1962) Acheilognathus asmussii (Dybowski, 1872) (Russian bitterling) Acheilognathus barbatulus Günther, 1873 Acheilognathus barbatus Nichols, 1926 Acheilognathus binidentatus G. L. Li 2001 Acheilognathus brevicaudatus Y. R. Chen & Z. Y. Li, 1987 Acheilognathus changtingensis Qing Yang, Y. R. Zhu, B. X. Xiong & H. Z. Liu, 2011 Acheilognathus chankaensis (Dybowski, 1872) (Khanka spiny bitterling) Acheilognathus coreanus Steindachner, 1892 Acheilognathus cyanostigma D. S. Jordan & Fowler, 1903 (Striped bitterling) Acheilognathus deignani (H. M. Smith, 1945) Acheilognathus elongatus (Regan, 1908) (Elongate bitterling) Acheilognathus fasciodorsalis V. H. Nguyễn, 2002 Acheilognathus gracilis Nichols, 1926 Acheilognathus guichenoti (Bleeker, 1871) Acheilognathus hypselonotus (Bleeker, 1871) Acheilognathus imberbis Günther, 1868 Acheilognathus imfasciodorsalis V. H. Nguyễn, 2002 Acheilognathus lanchiensis (Herre & S.-Y. Lin, 1936) Acheilognathus longibarbatus (Mai, 1978) Acheilognathus longipinnis Regan, 1905 (Deepbody bitterling) Acheilognathus longispinnis (Ōshima, 1926) Acheilognathus macromandibularis A. Doi, R. Arai & H. Z. Liu, 1999 Acheilognathus macropterus (Bleeker, 1871) Acheilognathus majusculus I. S. Kim & H. Yang, 1998 Acheilognathus melanogaster Bleeker, 1860 (Japanese bitterling) Acheilognathus mengyangensis Z. G. Chen, J. H. Gong & Y. S. Guo, 2021 Acheilognathus meridianus (H. W. Wu, 1939) Acheilognathus microphysa J. X. Yang, X. L. Chu & Y. R. Chen, 1990 Acheilognathus nanchongensis X. J. Deng, 1996 Acheilognathus nguyenvanhaoi H. D. Nguyễn, Đ. H. Trần & T. T. Tạ, 2013 Acheilognathus omeiensis (H. J. Shih & T. L. Tchang, 1934) Acheilognathus polylepis (H. W. Wu, 1964) Acheilognathus polyspinus (Holčík, 1972) Acheilognathus rhombeus (Temminck & Schlegel, 1846) Acheilognathus striatus Qing Yang, B. X. Xiong, Q. Y. Tang & H. Z. Liu, 2010 Acheilognathus tabira D. S. Jordan & W. F. Thompson, 1914 Acheilognathus tonkinensis (Vaillant 1892) Acheilognathus typus (Bleeker, 1863) Acheilognathus yamatsutae Mori, 1928 Synonyms Acheilognathus elongatoides Kottelat, 2001; valid as R. elongatus
In addition, there may be two undescribed species in Korea awaiting further study: Acheilognathus sp. Acheilognathus sp. HR
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