Phallostethus is a small genus of fishes in the family Phallostethidae native to freshwater and brackish habitats in southeast Asia.
Species The currently recognized species in this genus are: Phallostethus cuulong Shibukawa, Đ. Đ. Trần & X. L. Trần, 2012Shibukawa, K., Tran, D.D. & Tran, L.X. (2012): Phallostethus cuulong, a new species of priapiumfish (Actinopterygii: Atheriniformes: Phallostethidae) from the Vietnamese Mekong. Zootaxa, 3363: 45–51. Phallostethus dunckeri Regan, 1913 Phallostethus lehi Parenti, 1996
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